From 0509ae4165e190c2f65e8001578287f78313be30 Mon Sep 17 00:00:00 2001
From: kajte <33686434+kajte@users.noreply.github.com>
Date: Mon, 27 Nov 2023 23:06:26 +0200
Subject: [PATCH 1/3] Add support for number symbols of different numbering
 systems

- Import number symbols for available  numbering systems from cldr data
- Add default_numbering_system  and other_numbering_systems properties for Locale
- Add numbering_system argument to relevant number formatting fuctions and use number symbols based on the given numbering system

Fixes partially issue https://github.com/python-babel/babel/issues/446
---
 babel/core.py          |  32 ++++-
 babel/numbers.py       | 274 ++++++++++++++++++++++++++++++++++-------
 babel/support.py       |  35 ++++--
 babel/units.py         |  48 +++++++-
 scripts/import_cldr.py |  24 +++-
 tests/test_core.py     |  22 +++-
 tests/test_numbers.py  |  77 ++++++++++++
 tests/test_smoke.py    |   5 +
 tests/test_support.py  |  60 +++++++--
 9 files changed, 495 insertions(+), 82 deletions(-)

diff --git a/babel/core.py b/babel/core.py
index 782c8f26a..207c13b92 100644
--- a/babel/core.py
+++ b/babel/core.py
@@ -149,7 +149,7 @@ class Locale:
     `Locale` objects provide access to a collection of locale data, such as
     territory and language names, number and date format patterns, and more:
 
-    >>> locale.number_symbols['decimal']
+    >>> locale.number_symbols['latn']['decimal']
     u'.'
 
     If a locale is requested for which no locale data is available, an
@@ -625,16 +625,42 @@ def currency_symbols(self) -> localedata.LocaleDataDict:
 
     @property
     def number_symbols(self) -> localedata.LocaleDataDict:
-        """Symbols used in number formatting.
+        """Symbols used in number formatting by number system.
 
         .. note:: The format of the value returned may change between
                   Babel versions.
 
-        >>> Locale('fr', 'FR').number_symbols['decimal']
+        >>> Locale('fr', 'FR').number_symbols["latn"]['decimal']
         u','
+        >>> Locale('fa', 'IR').number_symbols["arabext"]['decimal']
+        u'٫'
+        >>> Locale('fa', 'IR').number_symbols["latn"]['decimal']
+        u'.'
         """
         return self._data['number_symbols']
 
+    @property
+    def other_numbering_systems(self) -> localedata.LocaleDataDict:
+        """
+        Mapping of other numbering systems available for the locale.
+        See: https://www.unicode.org/reports/tr35/tr35-numbers.html#otherNumberingSystems
+
+        >>> Locale('el', 'GR').other_numbering_systems['traditional']
+        u'grek'
+
+        .. note:: The format of the value returned may change between
+                  Babel versions.
+        """
+        return self._data['numbering_systems']
+
+    @property
+    def default_numbering_system(self) -> str:
+        """The default numbering system used by the locale.
+        >>> Locale('el', 'GR').default_numbering_system
+        u'latn'
+        """
+        return self._data['default_numbering_system']
+
     @property
     def decimal_formats(self) -> localedata.LocaleDataDict:
         """Locale patterns for decimal number formatting.
diff --git a/babel/numbers.py b/babel/numbers.py
index c6fcb9504..a9c19510d 100644
--- a/babel/numbers.py
+++ b/babel/numbers.py
@@ -317,70 +317,161 @@ def _is_active(start, end):
     return result
 
 
-def get_decimal_symbol(locale: Locale | str | None = LC_NUMERIC) -> str:
+def _get_numbering_system(locale: Locale, numbering_system: Literal["default"] | str = "latn") -> str:
+    if numbering_system == "default":
+        return locale.default_numbering_system
+    else:
+        return numbering_system
+
+
+def _get_number_symbols(
+    locale: Locale | str,
+    *,
+    numbering_system: Literal["default"] | str = "latn"
+) -> LocaleDataDict:
+    parsed_locale = Locale.parse(locale)
+    numbering_system = _get_numbering_system(parsed_locale, numbering_system)
+    try:
+        return parsed_locale.number_symbols[numbering_system]
+    except KeyError as error:
+        raise UnsupportedNumberingSystemError(f"Unknown numbering system {numbering_system} for Locale {parsed_locale}.") from error
+
+
+class UnsupportedNumberingSystemError(Exception):
+    """Exception thrown when an unsupported numbering system is requested for the given Locale."""
+    pass
+
+
+def get_decimal_symbol(
+    locale: Locale | str | None = LC_NUMERIC,
+    *,
+    numbering_system: Literal["default"] | str = "latn",
+) -> str:
     """Return the symbol used by the locale to separate decimal fractions.
 
     >>> get_decimal_symbol('en_US')
     u'.'
+    >>> get_decimal_symbol('ar_EG', numbering_system='default')
+    u'٫'
+    >>> get_decimal_symbol('ar_EG', numbering_system='latn')
+    u'.'
 
     :param locale: the `Locale` object or locale identifier
+    :param numbering_system: The numbering system used for fetching the symbol. Defaults to "latn".
+                             The special value "default" will use the default numbering system of the locale.
+    :raise `UnsupportedNumberingSystemError`: If the numbering system is not supported by the locale.
     """
-    return Locale.parse(locale).number_symbols.get('decimal', '.')
+    return _get_number_symbols(locale, numbering_system=numbering_system).get('decimal', '.')
 
 
-def get_plus_sign_symbol(locale: Locale | str | None = LC_NUMERIC) -> str:
+def get_plus_sign_symbol(
+    locale: Locale | str | None = LC_NUMERIC,
+    *,
+    numbering_system: Literal["default"] | str = "latn",
+) -> str:
     """Return the plus sign symbol used by the current locale.
 
     >>> get_plus_sign_symbol('en_US')
     u'+'
+    >>> get_plus_sign_symbol('ar_EG', numbering_system='default')
+    u'\u061c+'
+    >>> get_plus_sign_symbol('ar_EG', numbering_system='latn')
+    u'\u200e+'
 
     :param locale: the `Locale` object or locale identifier
+    :param numbering_system: The numbering system used for fetching the symbol. Defaults to "latn".
+                             The special value "default" will use the default numbering system of the locale.
+    :raise `UnsupportedNumberingSystemError`: if the numbering system is not supported by the locale.
     """
-    return Locale.parse(locale).number_symbols.get('plusSign', '+')
+    return _get_number_symbols(locale, numbering_system=numbering_system).get('plusSign', '+')
 
 
-def get_minus_sign_symbol(locale: Locale | str | None = LC_NUMERIC) -> str:
+def get_minus_sign_symbol(
+    locale: Locale | str | None = LC_NUMERIC,
+    *,
+    numbering_system: Literal["default"] | str = "latn",
+) -> str:
     """Return the plus sign symbol used by the current locale.
 
     >>> get_minus_sign_symbol('en_US')
     u'-'
+    >>> get_minus_sign_symbol('ar_EG', numbering_system='default')
+    u'\u061c-'
+    >>> get_minus_sign_symbol('ar_EG', numbering_system='latn')
+    u'\u200e-'
 
     :param locale: the `Locale` object or locale identifier
+    :param numbering_system: The numbering system used for fetching the symbol. Defaults to "latn".
+                             The special value "default" will use the default numbering system of the locale.
+    :raise `UnsupportedNumberingSystemError`: if the numbering system is not supported by the locale.
     """
-    return Locale.parse(locale).number_symbols.get('minusSign', '-')
+    return _get_number_symbols(locale, numbering_system=numbering_system).get('minusSign', '-')
 
 
-def get_exponential_symbol(locale: Locale | str | None = LC_NUMERIC) -> str:
+def get_exponential_symbol(
+    locale: Locale | str | None = LC_NUMERIC,
+    *,
+    numbering_system: Literal["default"] | str = "latn",
+) -> str:
     """Return the symbol used by the locale to separate mantissa and exponent.
 
     >>> get_exponential_symbol('en_US')
     u'E'
+    >>> get_exponential_symbol('ar_EG', numbering_system='default')
+    u'اس'
+    >>> get_exponential_symbol('ar_EG', numbering_system='latn')
+    u'E'
 
     :param locale: the `Locale` object or locale identifier
+    :param numbering_system: The numbering system used for fetching the symbol. Defaults to "latn".
+                             The special value "default" will use the default numbering system of the locale.
+    :raise `UnsupportedNumberingSystemError`: if the numbering system is not supported by the locale.
     """
-    return Locale.parse(locale).number_symbols.get('exponential', 'E')
+    return _get_number_symbols(locale, numbering_system=numbering_system).get('exponential', 'E')
 
 
-def get_group_symbol(locale: Locale | str | None = LC_NUMERIC) -> str:
+def get_group_symbol(
+    locale: Locale | str | None = LC_NUMERIC,
+    *,
+    numbering_system: Literal["default"] | str = "latn",
+) -> str:
     """Return the symbol used by the locale to separate groups of thousands.
 
     >>> get_group_symbol('en_US')
     u','
+    >>> get_group_symbol('ar_EG', numbering_system='default')
+    u'٬'
+    >>> get_group_symbol('ar_EG', numbering_system='latn')
+    u','
 
     :param locale: the `Locale` object or locale identifier
+    :param numbering_system: The numbering system used for fetching the symbol. Defaults to "latn".
+                             The special value "default" will use the default numbering system of the locale.
+    :raise `UnsupportedNumberingSystemError`: if the numbering system is not supported by the locale.
     """
-    return Locale.parse(locale).number_symbols.get('group', ',')
+    return _get_number_symbols(locale, numbering_system=numbering_system).get('group', ',')
 
 
-def get_infinity_symbol(locale: Locale | str | None = LC_NUMERIC) -> str:
+def get_infinity_symbol(
+    locale: Locale | str | None = LC_NUMERIC,
+    *,
+    numbering_system: Literal["default"] | str = "latn",
+) -> str:
     """Return the symbol used by the locale to represent infinity.
 
     >>> get_infinity_symbol('en_US')
     u'∞'
+    >>> get_infinity_symbol('ar_EG', numbering_system='default')
+    u'∞'
+    >>> get_infinity_symbol('ar_EG', numbering_system='latn')
+    u'∞'
 
     :param locale: the `Locale` object or locale identifier
+    :param numbering_system: The numbering system used for fetching the symbol. Defaults to "latn".
+                             The special value "default" will use the default numbering system of the locale.
+    :raise `UnsupportedNumberingSystemError`: if the numbering system is not supported by the locale.
     """
-    return Locale.parse(locale).number_symbols.get('infinity', '∞')
+    return _get_number_symbols(locale, numbering_system=numbering_system).get('infinity', '∞')
 
 
 def format_number(number: float | decimal.Decimal | str, locale: Locale | str | None = LC_NUMERIC) -> str:
@@ -430,6 +521,8 @@ def format_decimal(
     locale: Locale | str | None = LC_NUMERIC,
     decimal_quantization: bool = True,
     group_separator: bool = True,
+    *,
+    numbering_system: Literal["default"] | str = "latn",
 ) -> str:
     """Return the given decimal number formatted for a specific locale.
 
@@ -443,6 +536,10 @@ def format_decimal(
     u'1,234'
     >>> format_decimal(1.2345, locale='de')
     u'1,234'
+    >>> format_decimal(1.2345, locale='ar_EG', numbering_system='default')
+    u'1٫234'
+    >>> format_decimal(1.2345, locale='ar_EG', numbering_system='latn')
+    u'1.234'
 
     The appropriate thousands grouping and the decimal separator are used for
     each locale:
@@ -470,13 +567,16 @@ def format_decimal(
                                  the format pattern. Defaults to `True`.
     :param group_separator: Boolean to switch group separator on/off in a locale's
                             number format.
+    :param numbering_system: The numbering system used for formatting number symbols. Defaults to "latn".
+                             The special value "default" will use the default numbering system of the locale.
+    :raise `UnsupportedNumberingSystemError`: If the numbering system is not supported by the locale.
     """
     locale = Locale.parse(locale)
     if format is None:
         format = locale.decimal_formats[format]
     pattern = parse_pattern(format)
     return pattern.apply(
-        number, locale, decimal_quantization=decimal_quantization, group_separator=group_separator)
+        number, locale, decimal_quantization=decimal_quantization, group_separator=group_separator, numbering_system=numbering_system)
 
 
 def format_compact_decimal(
@@ -485,6 +585,7 @@ def format_compact_decimal(
     format_type: Literal["short", "long"] = "short",
     locale: Locale | str | None = LC_NUMERIC,
     fraction_digits: int = 0,
+    numbering_system: Literal["default"] | str = "latn",
 ) -> str:
     """Return the given decimal number formatted for a specific locale in compact form.
 
@@ -500,11 +601,16 @@ def format_compact_decimal(
     u'2 милиони'
     >>> format_compact_decimal(21000000, format_type="long", locale="mk")
     u'21 милион'
+    >>> format_compact_decimal(12345, format_type="short", locale='ar_EG', fraction_digits=2, numbering_system='default')
+    u'12٫34\xa0ألف'
 
     :param number: the number to format
     :param format_type: Compact format to use ("short" or "long")
     :param locale: the `Locale` object or locale identifier
     :param fraction_digits: Number of digits after the decimal point to use. Defaults to `0`.
+    :param numbering_system: The numbering system used for formatting number symbols. Defaults to "latn".
+                             The special value "default" will use the default numbering system of the locale.
+    :raise `UnsupportedNumberingSystemError`: If the numbering system is not supported by the locale.
     """
     locale = Locale.parse(locale)
     compact_format = locale.compact_decimal_formats[format_type]
@@ -513,7 +619,7 @@ def format_compact_decimal(
     if format is None:
         format = locale.decimal_formats[None]
     pattern = parse_pattern(format)
-    return pattern.apply(number, locale, decimal_quantization=False)
+    return pattern.apply(number, locale, decimal_quantization=False, numbering_system=numbering_system)
 
 
 def _get_compact_format(
@@ -569,6 +675,8 @@ def format_currency(
     format_type: Literal["name", "standard", "accounting"] = "standard",
     decimal_quantization: bool = True,
     group_separator: bool = True,
+    *,
+    numbering_system: Literal["default"] | str = "latn",
 ) -> str:
     """Return formatted currency value.
 
@@ -578,6 +686,8 @@ def format_currency(
     u'US$1.099,98'
     >>> format_currency(1099.98, 'EUR', locale='de_DE')
     u'1.099,98\\xa0\\u20ac'
+    >>> format_currency(1099.98, 'EGP', locale='ar_EG', numbering_system='default')
+    u'\u200f1٬099٫98\xa0ج.م.\u200f'
 
     The format can also be specified explicitly.  The currency is
     placed with the '¤' sign.  As the sign gets repeated the format
@@ -655,12 +765,15 @@ def format_currency(
                                  the format pattern. Defaults to `True`.
     :param group_separator: Boolean to switch group separator on/off in a locale's
                             number format.
-
+    :param numbering_system: The numbering system used for formatting number symbols. Defaults to "latn".
+                             The special value "default" will use the default numbering system of the locale.
+    :raise `UnsupportedNumberingSystemError`: If the numbering system is not supported by the locale.
     """
     if format_type == 'name':
         return _format_currency_long_name(number, currency, format=format,
                                           locale=locale, currency_digits=currency_digits,
-                                          decimal_quantization=decimal_quantization, group_separator=group_separator)
+                                          decimal_quantization=decimal_quantization, group_separator=group_separator,
+                                          numbering_system=numbering_system)
     locale = Locale.parse(locale)
     if format:
         pattern = parse_pattern(format)
@@ -672,7 +785,7 @@ def format_currency(
 
     return pattern.apply(
         number, locale, currency=currency, currency_digits=currency_digits,
-        decimal_quantization=decimal_quantization, group_separator=group_separator)
+        decimal_quantization=decimal_quantization, group_separator=group_separator, numbering_system=numbering_system)
 
 
 def _format_currency_long_name(
@@ -684,6 +797,8 @@ def _format_currency_long_name(
     format_type: Literal["name", "standard", "accounting"] = "standard",
     decimal_quantization: bool = True,
     group_separator: bool = True,
+    *,
+    numbering_system: Literal["default"] | str = "latn"
 ) -> str:
     # Algorithm described here:
     # https://www.unicode.org/reports/tr35/tr35-numbers.html#Currencies
@@ -710,7 +825,7 @@ def _format_currency_long_name(
 
     number_part = pattern.apply(
         number, locale, currency=currency, currency_digits=currency_digits,
-        decimal_quantization=decimal_quantization, group_separator=group_separator)
+        decimal_quantization=decimal_quantization, group_separator=group_separator, numbering_system=numbering_system)
 
     return unit_pattern.format(number_part, display_name)
 
@@ -722,6 +837,7 @@ def format_compact_currency(
     format_type: Literal["short"] = "short",
     locale: Locale | str | None = LC_NUMERIC,
     fraction_digits: int = 0,
+    numbering_system: Literal["default"] | str = "latn",
 ) -> str:
     """Format a number as a currency value in compact form.
 
@@ -737,6 +853,9 @@ def format_compact_currency(
     :param format_type: the compact format type to use. Defaults to "short".
     :param locale: the `Locale` object or locale identifier
     :param fraction_digits: Number of digits after the decimal point to use. Defaults to `0`.
+    :param numbering_system: The numbering system used for formatting number symbols. Defaults to "latn".
+                             The special value "default" will use the default numbering system of the locale.
+    :raise `UnsupportedNumberingSystemError`: If the numbering system is not supported by the locale.
     """
     locale = Locale.parse(locale)
     try:
@@ -759,7 +878,8 @@ def format_compact_currency(
     if format is None:
         raise ValueError('No compact currency format found for the given number and locale.')
     pattern = parse_pattern(format)
-    return pattern.apply(number, locale, currency=currency, currency_digits=False, decimal_quantization=False)
+    return pattern.apply(number, locale, currency=currency, currency_digits=False, decimal_quantization=False,
+                         numbering_system=numbering_system)
 
 
 def format_percent(
@@ -768,6 +888,8 @@ def format_percent(
     locale: Locale | str | None = LC_NUMERIC,
     decimal_quantization: bool = True,
     group_separator: bool = True,
+    *,
+    numbering_system: Literal["default"] | str = "latn"
 ) -> str:
     """Return formatted percent value for a specific locale.
 
@@ -777,6 +899,8 @@ def format_percent(
     u'2,512%'
     >>> format_percent(25.1234, locale='sv_SE')
     u'2\\xa0512\\xa0%'
+    >>> format_percent(25.1234, locale='ar_EG', numbering_system='default')
+    u'2٬512%'
 
     The format pattern can also be specified explicitly:
 
@@ -805,13 +929,18 @@ def format_percent(
                                  the format pattern. Defaults to `True`.
     :param group_separator: Boolean to switch group separator on/off in a locale's
                             number format.
+    :param numbering_system: The numbering system used for formatting number symbols. Defaults to "latn".
+                             The special value "default" will use the default numbering system of the locale.
+    :raise `UnsupportedNumberingSystemError`: If the numbering system is not supported by the locale.
     """
     locale = Locale.parse(locale)
     if not format:
         format = locale.percent_formats[None]
     pattern = parse_pattern(format)
     return pattern.apply(
-        number, locale, decimal_quantization=decimal_quantization, group_separator=group_separator)
+        number, locale, decimal_quantization=decimal_quantization, group_separator=group_separator,
+        numbering_system=numbering_system
+    )
 
 
 def format_scientific(
@@ -819,11 +948,15 @@ def format_scientific(
         format: str | NumberPattern | None = None,
         locale: Locale | str | None = LC_NUMERIC,
         decimal_quantization: bool = True,
+        *,
+        numbering_system: Literal["default"] | str = "latn"
 ) -> str:
     """Return value formatted in scientific notation for a specific locale.
 
     >>> format_scientific(10000, locale='en_US')
     u'1E4'
+    >>> format_scientific(10000, locale='ar_EG', numbering_system='default')
+    u'1اس4'
 
     The format pattern can also be specified explicitly:
 
@@ -844,13 +977,16 @@ def format_scientific(
     :param locale: the `Locale` object or locale identifier
     :param decimal_quantization: Truncate and round high-precision numbers to
                                  the format pattern. Defaults to `True`.
+    :param numbering_system: The numbering system used for formatting number symbols. Defaults to "latn".
+                             The special value "default" will use the default numbering system of the locale.
+    :raise `UnsupportedNumberingSystemError`: If the numbering system is not supported by the locale.
     """
     locale = Locale.parse(locale)
     if not format:
         format = locale.scientific_formats[None]
     pattern = parse_pattern(format)
     return pattern.apply(
-        number, locale, decimal_quantization=decimal_quantization)
+        number, locale, decimal_quantization=decimal_quantization, numbering_system=numbering_system)
 
 
 class NumberFormatError(ValueError):
@@ -862,7 +998,12 @@ def __init__(self, message: str, suggestions: list[str] | None = None) -> None:
         self.suggestions = suggestions
 
 
-def parse_number(string: str, locale: Locale | str | None = LC_NUMERIC) -> int:
+def parse_number(
+    string: str,
+    locale: Locale | str | None = LC_NUMERIC,
+    *,
+    numbering_system: Literal["default"] | str = "latn",
+) -> int:
     """Parse localized number string into an integer.
 
     >>> parse_number('1,099', locale='en_US')
@@ -879,16 +1020,25 @@ def parse_number(string: str, locale: Locale | str | None = LC_NUMERIC) -> int:
 
     :param string: the string to parse
     :param locale: the `Locale` object or locale identifier
+    :param numbering_system: The numbering system used for formatting number symbols. Defaults to "latn".
+                             The special value "default" will use the default numbering system of the locale.
     :return: the parsed number
     :raise `NumberFormatError`: if the string can not be converted to a number
+    :raise `UnsupportedNumberingSystemError`: if the numbering system is not supported by the locale.
     """
     try:
-        return int(string.replace(get_group_symbol(locale), ''))
+        return int(string.replace(get_group_symbol(locale, numbering_system=numbering_system), ''))
     except ValueError as ve:
         raise NumberFormatError(f"{string!r} is not a valid number") from ve
 
 
-def parse_decimal(string: str, locale: Locale | str | None = LC_NUMERIC, strict: bool = False) -> decimal.Decimal:
+def parse_decimal(
+    string: str,
+    locale: Locale | str | None = LC_NUMERIC,
+    strict: bool = False,
+    *,
+    numbering_system: Literal["default"] | str = "latn",
+) -> decimal.Decimal:
     """Parse localized decimal string into a decimal.
 
     >>> parse_decimal('1,099.98', locale='en_US')
@@ -897,6 +1047,8 @@ def parse_decimal(string: str, locale: Locale | str | None = LC_NUMERIC, strict:
     Decimal('1099.98')
     >>> parse_decimal('12 345,123', locale='ru')
     Decimal('12345.123')
+    >>> parse_decimal('1٬099٫98', locale='ar_EG', numbering_system='default')
+    Decimal('1099.98')
 
     When the given string cannot be parsed, an exception is raised:
 
@@ -922,12 +1074,15 @@ def parse_decimal(string: str, locale: Locale | str | None = LC_NUMERIC, strict:
     :param locale: the `Locale` object or locale identifier
     :param strict: controls whether numbers formatted in a weird way are
                    accepted or rejected
+    :param numbering_system: The numbering system used for formatting number symbols. Defaults to "latn".
+                             The special value "default" will use the default numbering system of the locale.
     :raise NumberFormatError: if the string can not be converted to a
                               decimal number
+    :raise UnsupportedNumberingSystemError: if the numbering system is not supported by the locale.
     """
     locale = Locale.parse(locale)
-    group_symbol = get_group_symbol(locale)
-    decimal_symbol = get_decimal_symbol(locale)
+    group_symbol = get_group_symbol(locale, numbering_system=numbering_system)
+    decimal_symbol = get_decimal_symbol(locale, numbering_system=numbering_system)
 
     if not strict and (
         group_symbol == '\xa0' and  # if the grouping symbol is U+00A0 NO-BREAK SPACE,
@@ -943,7 +1098,7 @@ def parse_decimal(string: str, locale: Locale | str | None = LC_NUMERIC, strict:
     except decimal.InvalidOperation as exc:
         raise NumberFormatError(f"{string!r} is not a valid decimal number") from exc
     if strict and group_symbol in string:
-        proper = format_decimal(parsed, locale=locale, decimal_quantization=False)
+        proper = format_decimal(parsed, locale=locale, decimal_quantization=False, numbering_system=numbering_system)
         if string != proper and string.rstrip('0') != (proper + decimal_symbol):
             try:
                 parsed_alt = decimal.Decimal(string.replace(decimal_symbol, '')
@@ -955,7 +1110,12 @@ def parse_decimal(string: str, locale: Locale | str | None = LC_NUMERIC, strict:
                     suggestions=[proper],
                 ) from exc
             else:
-                proper_alt = format_decimal(parsed_alt, locale=locale, decimal_quantization=False)
+                proper_alt = format_decimal(
+                    parsed_alt,
+                    locale=locale,
+                    decimal_quantization=False,
+                    numbering_system=numbering_system
+                )
                 if proper_alt == proper:
                     raise NumberFormatError(
                         f"{string!r} is not a properly formatted decimal number. "
@@ -1111,7 +1271,12 @@ def compute_scale(self) -> Literal[0, 2, 3]:
             scale = 3
         return scale
 
-    def scientific_notation_elements(self, value: decimal.Decimal, locale: Locale | str | None) -> tuple[decimal.Decimal, int, str]:
+    def scientific_notation_elements(
+        self,
+        value: decimal.Decimal,
+        locale: Locale | str | None,
+        numbering_system: str
+    ) -> tuple[decimal.Decimal, int, str]:
         """ Returns normalized scientific notation components of a value.
         """
         # Normalize value to only have one lead digit.
@@ -1129,9 +1294,9 @@ def scientific_notation_elements(self, value: decimal.Decimal, locale: Locale |
         # Get exponent sign symbol.
         exp_sign = ''
         if exp < 0:
-            exp_sign = get_minus_sign_symbol(locale)
+            exp_sign = get_minus_sign_symbol(locale, numbering_system=numbering_system)
         elif self.exp_plus:
-            exp_sign = get_plus_sign_symbol(locale)
+            exp_sign = get_plus_sign_symbol(locale, numbering_system=numbering_system)
 
         # Normalize exponent value now that we have the sign.
         exp = abs(exp)
@@ -1147,6 +1312,8 @@ def apply(
         decimal_quantization: bool = True,
         force_frac: tuple[int, int] | None = None,
         group_separator: bool = True,
+        *,
+        numbering_system: Literal["default"] | str = "latn"
     ):
         """Renders into a string a number following the defined pattern.
 
@@ -1170,8 +1337,11 @@ def apply(
         :type decimal_quantization: bool
         :param force_frac: DEPRECATED - a forced override for `self.frac_prec`
                            for a single formatting invocation.
+        :param numbering_system: The numbering system used for formatting number symbols. Defaults to "latn", special
+                                 value "default" will use the default numbering system of the locale.
         :return: Formatted decimal string.
         :rtype: str
+        :raise UnsupportedNumberingSystemError: If the numbering system is not supported by the locale.
         """
         if not isinstance(value, decimal.Decimal):
             value = decimal.Decimal(str(value))
@@ -1184,7 +1354,7 @@ def apply(
 
         # Prepare scientific notation metadata.
         if self.exp_prec:
-            value, exp, exp_sign = self.scientific_notation_elements(value, locale)
+            value, exp, exp_sign = self.scientific_notation_elements(value, locale, numbering_system=numbering_system)
 
         # Adjust the precision of the fractional part and force it to the
         # currency's if necessary.
@@ -1213,10 +1383,10 @@ def apply(
         # Render scientific notation.
         if self.exp_prec:
             number = ''.join([
-                self._quantize_value(value, locale, frac_prec, group_separator),
-                get_exponential_symbol(locale),
+                self._quantize_value(value, locale, frac_prec, group_separator, numbering_system=numbering_system),
+                get_exponential_symbol(locale, numbering_system=numbering_system),
                 exp_sign,  # type: ignore  # exp_sign is always defined here
-                self._format_int(str(exp), self.exp_prec[0], self.exp_prec[1], locale),  # type: ignore  # exp is always defined here
+                self._format_int(str(exp), self.exp_prec[0], self.exp_prec[1], locale, numbering_system=numbering_system),  # type: ignore  # exp is always defined here
             ])
 
         # Is it a significant digits pattern?
@@ -1225,13 +1395,13 @@ def apply(
                                             self.int_prec[0],
                                             self.int_prec[1])
             a, sep, b = text.partition(".")
-            number = self._format_int(a, 0, 1000, locale)
+            number = self._format_int(a, 0, 1000, locale, numbering_system=numbering_system)
             if sep:
-                number += get_decimal_symbol(locale) + b
+                number += get_decimal_symbol(locale, numbering_system=numbering_system) + b
 
         # A normal number pattern.
         else:
-            number = self._quantize_value(value, locale, frac_prec, group_separator)
+            number = self._quantize_value(value, locale, frac_prec, group_separator, numbering_system=numbering_system)
 
         retval = ''.join([
             self.prefix[is_negative],
@@ -1288,33 +1458,45 @@ def _format_significant(self, value: decimal.Decimal, minimum: int, maximum: int
             ).rstrip('.')
         return result
 
-    def _format_int(self, value: str, min: int, max: int, locale: Locale | str | None) -> str:
+    def _format_int(self, value: str, min: int, max: int, locale: Locale | str | None, numbering_system: str) -> str:
         width = len(value)
         if width < min:
             value = '0' * (min - width) + value
         gsize = self.grouping[0]
         ret = ''
-        symbol = get_group_symbol(locale)
+        symbol = get_group_symbol(locale, numbering_system=numbering_system)
         while len(value) > gsize:
             ret = symbol + value[-gsize:] + ret
             value = value[:-gsize]
             gsize = self.grouping[1]
         return value + ret
 
-    def _quantize_value(self, value: decimal.Decimal, locale: Locale | str | None, frac_prec: tuple[int, int], group_separator: bool) -> str:
+    def _quantize_value(
+        self,
+        value: decimal.Decimal,
+        locale: Locale | str | None,
+        frac_prec: tuple[int, int], group_separator: bool,
+        numbering_system: str,
+    ) -> str:
         # If the number is +/-Infinity, we can't quantize it
         if value.is_infinite():
-            return get_infinity_symbol(locale)
+            return get_infinity_symbol(locale, numbering_system=numbering_system)
         quantum = get_decimal_quantum(frac_prec[1])
         rounded = value.quantize(quantum)
         a, sep, b = f"{rounded:f}".partition(".")
         integer_part = a
         if group_separator:
-            integer_part = self._format_int(a, self.int_prec[0], self.int_prec[1], locale)
-        number = integer_part + self._format_frac(b or '0', locale, frac_prec)
+            integer_part = self._format_int(a, self.int_prec[0], self.int_prec[1], locale, numbering_system=numbering_system)
+        number = integer_part + self._format_frac(b or '0', locale=locale, force_frac=frac_prec, numbering_system=numbering_system)
         return number
 
-    def _format_frac(self, value: str, locale: Locale | str | None, force_frac: tuple[int, int] | None = None) -> str:
+    def _format_frac(
+        self,
+        value: str,
+        numbering_system: str,
+        locale: Locale | str | None,
+        force_frac: tuple[int, int] | None = None,
+    ) -> str:
         min, max = force_frac or self.frac_prec
         if len(value) < min:
             value += ('0' * (min - len(value)))
@@ -1322,4 +1504,4 @@ def _format_frac(self, value: str, locale: Locale | str | None, force_frac: tupl
             return ''
         while len(value) > min and value[-1] == '0':
             value = value[:-1]
-        return get_decimal_symbol(locale) + value
+        return get_decimal_symbol(locale, numbering_system=numbering_system) + value
diff --git a/babel/support.py b/babel/support.py
index 8d03934a3..dd5c996f3 100644
--- a/babel/support.py
+++ b/babel/support.py
@@ -49,14 +49,23 @@ class Format:
     u'1.234'
     """
 
-    def __init__(self, locale: Locale | str, tzinfo: datetime.tzinfo | None = None) -> None:
+    def __init__(
+        self,
+        locale: Locale | str,
+        tzinfo: datetime.tzinfo | None = None,
+        numbering_system: Literal["default"] | str = "latn",
+    ) -> None:
         """Initialize the formatter.
 
         :param locale: the locale identifier or `Locale` instance
         :param tzinfo: the time-zone info (a `tzinfo` instance or `None`)
+        :param numbering_system: The numbering system used for formatting number symbols. Defaults to "latn".
+                                 The special value "default" will use the default numbering system of the locale.
+        :raise `UnsupportedNumberingSystemError`: If the numbering system is not supported by the locale.
         """
         self.locale = Locale.parse(locale)
         self.tzinfo = tzinfo
+        self.numbering_system = numbering_system
 
     def date(
         self,
@@ -129,7 +138,7 @@ def number(self, number: float | decimal.Decimal | str) -> str:
         >>> fmt.number(1099)
         u'1,099'
         """
-        return format_decimal(number, locale=self.locale)
+        return format_decimal(number, locale=self.locale, numbering_system=self.numbering_system)
 
     def decimal(self, number: float | decimal.Decimal | str, format: str | None = None) -> str:
         """Return a decimal number formatted for the locale.
@@ -138,7 +147,7 @@ def decimal(self, number: float | decimal.Decimal | str, format: str | None = No
         >>> fmt.decimal(1.2345)
         u'1.234'
         """
-        return format_decimal(number, format, locale=self.locale)
+        return format_decimal(number, format, locale=self.locale, numbering_system=self.numbering_system)
 
     def compact_decimal(
         self,
@@ -154,14 +163,18 @@ def compact_decimal(
         >>> fmt.compact_decimal(1234567, format_type='long', fraction_digits=2)
         '1.23 million'
         """
-        return format_compact_decimal(number, format_type=format_type,
-                                      fraction_digits=fraction_digits,
-                                      locale=self.locale)
+        return format_compact_decimal(
+            number,
+            format_type=format_type,
+            fraction_digits=fraction_digits,
+            locale=self.locale,
+            numbering_system=self.numbering_system,
+        )
 
     def currency(self, number: float | decimal.Decimal | str, currency: str) -> str:
         """Return a number in the given currency formatted for the locale.
         """
-        return format_currency(number, currency, locale=self.locale)
+        return format_currency(number, currency, locale=self.locale, numbering_system=self.numbering_system)
 
     def compact_currency(
         self,
@@ -176,8 +189,8 @@ def compact_currency(
         >>> Format('en_US').compact_currency(1234567, "USD", format_type='short', fraction_digits=2)
         '$1.23M'
         """
-        return format_compact_currency(number, currency, format_type=format_type,
-                                        fraction_digits=fraction_digits, locale=self.locale)
+        return format_compact_currency(number, currency, format_type=format_type, fraction_digits=fraction_digits,
+                                       locale=self.locale, numbering_system=self.numbering_system)
 
     def percent(self, number: float | decimal.Decimal | str, format: str | None = None) -> str:
         """Return a number formatted as percentage for the locale.
@@ -186,12 +199,12 @@ def percent(self, number: float | decimal.Decimal | str, format: str | None = No
         >>> fmt.percent(0.34)
         u'34%'
         """
-        return format_percent(number, format, locale=self.locale)
+        return format_percent(number, format, locale=self.locale, numbering_system=self.numbering_system)
 
     def scientific(self, number: float | decimal.Decimal | str) -> str:
         """Return a number formatted using scientific notation for the locale.
         """
-        return format_scientific(number, locale=self.locale)
+        return format_scientific(number, locale=self.locale, numbering_system=self.numbering_system)
 
 
 class LazyProxy:
diff --git a/babel/units.py b/babel/units.py
index 465d2263d..67f09299a 100644
--- a/babel/units.py
+++ b/babel/units.py
@@ -81,6 +81,8 @@ def format_unit(
     length: Literal['short', 'long', 'narrow'] = 'long',
     format: str | None = None,
     locale: Locale | str | None = LC_NUMERIC,
+    *,
+    numbering_system: Literal["default"] | str = "latn"
 ) -> str:
     """Format a value of a given unit.
 
@@ -95,6 +97,8 @@ def format_unit(
     u'1\\xa0200 millimeter kvikks\\xf8lv'
     >>> format_unit(270, 'ton', locale='en')
     u'270 tons'
+    >>> format_unit(1234.5, 'kilogram', locale='ar_EG', numbering_system='default')
+    u'1٬234٫5 كيلوغرام'
 
     Number formats may be overridden with the ``format`` parameter.
 
@@ -127,6 +131,9 @@ def format_unit(
     :param length: "short", "long" or "narrow"
     :param format: An optional format, as accepted by `format_decimal`.
     :param locale: the `Locale` object or locale identifier
+    :param numbering_system: The numbering system used for formatting number symbols. Defaults to "latn".
+                             The special value "default" will use the default numbering system of the locale.
+    :raise `UnsupportedNumberingSystemError`: If the numbering system is not supported by the locale.
     """
     locale = Locale.parse(locale)
 
@@ -139,7 +146,7 @@ def format_unit(
         formatted_value = value
         plural_form = "one"
     else:
-        formatted_value = format_decimal(value, format, locale)
+        formatted_value = format_decimal(value, format, locale, numbering_system=numbering_system)
         plural_form = locale.plural_form(value)
 
     if plural_form in unit_patterns:
@@ -211,6 +218,8 @@ def format_compound_unit(
     length: Literal["short", "long", "narrow"] = "long",
     format: str | None = None,
     locale: Locale | str | None = LC_NUMERIC,
+    *,
+    numbering_system: Literal["default"] | str = "latn"
 ) -> str | None:
     """
     Format a compound number value, i.e. "kilometers per hour" or similar.
@@ -230,6 +239,9 @@ def format_compound_unit(
     >>> format_compound_unit(32.5, "ton", 15, denominator_unit="hour", locale="en")
     '32.5 tons per 15 hours'
 
+    >>> format_compound_unit(1234.5, "ton", 15, denominator_unit="hour", locale="ar_EG", numbering_system="default")
+    '1٬234٫5 طن لكل 15 ساعة'
+
     >>> format_compound_unit(160, denominator_unit="square-meter", locale="fr")
     '160 par m\\xe8tre carr\\xe9'
 
@@ -254,7 +266,10 @@ def format_compound_unit(
     :param length: The formatting length. "short", "long" or "narrow"
     :param format: An optional format, as accepted by `format_decimal`.
     :param locale: the `Locale` object or locale identifier
+    :param numbering_system: The numbering system used for formatting number symbols. Defaults to "latn".
+                             The special value "default" will use the default numbering system of the locale.
     :return: A formatted compound value.
+    :raise `UnsupportedNumberingSystemError`: If the numbering system is not supported by the locale.
     """
     locale = Locale.parse(locale)
 
@@ -263,7 +278,14 @@ def format_compound_unit(
     if numerator_unit and denominator_unit and denominator_value == 1:
         compound_unit = _find_compound_unit(numerator_unit, denominator_unit, locale=locale)
         if compound_unit:
-            return format_unit(numerator_value, compound_unit, length=length, format=format, locale=locale)
+            return format_unit(
+                numerator_value,
+                compound_unit,
+                length=length,
+                format=format,
+                locale=locale,
+                numbering_system=numbering_system,
+            )
 
     # ... failing that, construct one "by hand".
 
@@ -271,10 +293,20 @@ def format_compound_unit(
         formatted_numerator = numerator_value
     elif numerator_unit:  # Numerator has unit
         formatted_numerator = format_unit(
-            numerator_value, numerator_unit, length=length, format=format, locale=locale,
+            numerator_value,
+            numerator_unit,
+            length=length,
+            format=format,
+            locale=locale,
+            numbering_system=numbering_system,
         )
     else:  # Unitless numerator
-        formatted_numerator = format_decimal(numerator_value, format=format, locale=locale)
+        formatted_numerator = format_decimal(
+            numerator_value,
+            format=format,
+            locale=locale,
+            numbering_system=numbering_system,
+        )
 
     if isinstance(denominator_value, str):  # Denominator is preformatted
         formatted_denominator = denominator_value
@@ -295,9 +327,15 @@ def format_compound_unit(
             length=length,
             format=format,
             locale=locale,
+            numbering_system=numbering_system,
         ).strip()
     else:  # Bare denominator
-        formatted_denominator = format_decimal(denominator_value, format=format, locale=locale)
+        formatted_denominator = format_decimal(
+            denominator_value,
+            format=format,
+            locale=locale,
+            numbering_system=numbering_system
+        )
 
     # TODO: this doesn't support "compound_variations" (or "prefix"), and will fall back to the "x/y" representation
     per_pattern = locale._data["compound_unit_patterns"].get("per", {}).get(length, {}).get("compound", "{0}/{1}")
diff --git a/scripts/import_cldr.py b/scripts/import_cldr.py
index 15d533980..1ff39a8d9 100755
--- a/scripts/import_cldr.py
+++ b/scripts/import_cldr.py
@@ -432,6 +432,7 @@ def _process_local_datas(sup, srcdir, destdir, force=False, dump_json=False):
             parse_interval_formats(data, calendar)
 
         parse_number_symbols(data, tree)
+        parse_numbering_systems(data, tree)
         parse_decimal_formats(data, tree)
         parse_scientific_formats(data, tree)
         parse_percent_formats(data, tree)
@@ -751,14 +752,27 @@ def parse_calendar_datetime_skeletons(data, calendar):
 
 def parse_number_symbols(data, tree):
     number_symbols = data.setdefault('number_symbols', {})
-    for symbol_elem in tree.findall('.//numbers/symbols'):
-        if _should_skip_number_elem(data, symbol_elem):  # TODO: Support other number systems
+    for symbol_system_elem in tree.findall('.//numbers/symbols'):
+        number_system = symbol_system_elem.get('numberSystem')
+        if not number_system:
             continue
 
-        for elem in symbol_elem.findall('./*'):
-            if _should_skip_elem(elem):
+        for symbol_element in symbol_system_elem.findall('./*'):
+            if _should_skip_elem(symbol_element):
                 continue
-            number_symbols[elem.tag] = str(elem.text)
+
+            number_symbols.setdefault(number_system, {})[symbol_element.tag] = str(symbol_element.text)
+
+
+def parse_numbering_systems(data, tree):
+    default_number_system_node = tree.find('.//numbers/defaultNumberingSystem')
+    if default_number_system_node is not None:
+        data['default_numbering_system'] = default_number_system_node.text
+
+    numbering_systems = data.setdefault('numbering_systems', {})
+    other_numbering_systems_node = tree.find('.//numbers/otherNumberingSystems') or []
+    for system in other_numbering_systems_node:
+        numbering_systems[system.tag] = system.text
 
 
 def parse_decimal_formats(data, tree):
diff --git a/tests/test_core.py b/tests/test_core.py
index aa370131d..2e7846214 100644
--- a/tests/test_core.py
+++ b/tests/test_core.py
@@ -19,7 +19,7 @@
 def test_locale_provides_access_to_cldr_locale_data():
     locale = Locale('en', 'US')
     assert locale.display_name == 'English (United States)'
-    assert locale.number_symbols['decimal'] == '.'
+    assert locale.number_symbols["latn"]['decimal'] == '.'
 
 
 def test_locale_repr():
@@ -162,7 +162,25 @@ def test_currency_symbols_property(self):
         assert Locale('es', 'CO').currency_symbols['USD'] == 'US$'
 
     def test_number_symbols_property(self):
-        assert Locale('fr', 'FR').number_symbols['decimal'] == ','
+        assert Locale('fr', 'FR').number_symbols["latn"]['decimal'] == ','
+        assert Locale('ar', 'IL').number_symbols["arab"]['percentSign'] == '٪\u061c'
+        assert Locale('ar', 'IL').number_symbols["latn"]['percentSign'] == '\u200e%\u200e'
+
+    def test_other_numbering_systems_property(self):
+        assert Locale('fr', 'FR').other_numbering_systems['native'] == 'latn'
+        assert 'traditional' not in Locale('fr', 'FR').other_numbering_systems
+
+        assert Locale('el', 'GR').other_numbering_systems['native'] == 'latn'
+        assert Locale('el', 'GR').other_numbering_systems['traditional'] == 'grek'
+
+    def test_default_numbering_systems_property(self):
+        assert Locale('en', 'GB').default_numbering_system == 'latn'
+        assert Locale('ar', 'EG').default_numbering_system == 'arab'
+
+    @pytest.mark.all_locales
+    def test_all_locales_have_default_numbering_system(self, locale):
+        locale = Locale.parse(locale)
+        assert locale.default_numbering_system
 
     def test_decimal_formats(self):
         assert Locale('en', 'US').decimal_formats[None].pattern == '#,##0.###'
diff --git a/tests/test_numbers.py b/tests/test_numbers.py
index 036780412..1eb001bcc 100644
--- a/tests/test_numbers.py
+++ b/tests/test_numbers.py
@@ -176,6 +176,12 @@ def test_compact(self):
         assert numbers.format_compact_decimal(1234, locale='it', format_type='long') == '1 mila'
         assert numbers.format_compact_decimal(1000, locale='fr', format_type='long') == 'mille'
         assert numbers.format_compact_decimal(1234, locale='fr', format_type='long') == '1 millier'
+        assert numbers.format_compact_decimal(
+            12345, format_type="short", locale='ar_EG', fraction_digits=2, numbering_system='default'
+        ) == '12٫34\xa0ألف'
+        assert numbers.format_compact_decimal(
+            12345, format_type="short", locale='ar_EG', fraction_digits=2, numbering_system='latn'
+        ) == '12.34\xa0ألف'
 
 
 class NumberParsingTestCase(unittest.TestCase):
@@ -183,8 +189,12 @@ class NumberParsingTestCase(unittest.TestCase):
     def test_can_parse_decimals(self):
         assert decimal.Decimal('1099.98') == numbers.parse_decimal('1,099.98', locale='en_US')
         assert decimal.Decimal('1099.98') == numbers.parse_decimal('1.099,98', locale='de')
+        assert decimal.Decimal('1099.98') == numbers.parse_decimal('1٬099٫98', locale='ar', numbering_system="default")
         with pytest.raises(numbers.NumberFormatError):
             numbers.parse_decimal('2,109,998', locale='de')
+        with pytest.raises(numbers.UnsupportedNumberingSystemError):
+            numbers.parse_decimal('2,109,998', locale='de', numbering_system="unknown")
+
 
     def test_parse_decimal_strict_mode(self):
         # Numbers with a misplaced grouping symbol should be rejected
@@ -317,23 +327,62 @@ def test_get_territory_currencies():
 
 def test_get_decimal_symbol():
     assert numbers.get_decimal_symbol('en_US') == '.'
+    assert numbers.get_decimal_symbol('en_US', numbering_system="default") == '.'
+    assert numbers.get_decimal_symbol('en_US', numbering_system="latn") == '.'
+    assert numbers.get_decimal_symbol('sv_SE') == ','
+    assert numbers.get_decimal_symbol('ar_EG') == '.'
+    assert numbers.get_decimal_symbol('ar_EG', numbering_system="default") == '٫'
+    assert numbers.get_decimal_symbol('ar_EG', numbering_system="latn") == '.'
+    assert numbers.get_decimal_symbol('ar_EG', numbering_system="arab") == '٫'
 
 
 def test_get_plus_sign_symbol():
     assert numbers.get_plus_sign_symbol('en_US') == '+'
+    assert numbers.get_plus_sign_symbol('en_US', numbering_system="default") == '+'
+    assert numbers.get_plus_sign_symbol('en_US', numbering_system="latn") == '+'
+    assert numbers.get_plus_sign_symbol('ar_EG') == '\u200e+'
+    assert numbers.get_plus_sign_symbol('ar_EG', numbering_system="default") == '\u061c+'
+    assert numbers.get_plus_sign_symbol('ar_EG', numbering_system="arab") == '\u061c+'
+    assert numbers.get_plus_sign_symbol('ar_EG', numbering_system="latn") == '\u200e+'
 
 
 def test_get_minus_sign_symbol():
     assert numbers.get_minus_sign_symbol('en_US') == '-'
+    assert numbers.get_minus_sign_symbol('en_US', numbering_system="default") == '-'
+    assert numbers.get_minus_sign_symbol('en_US', numbering_system="latn") == '-'
     assert numbers.get_minus_sign_symbol('nl_NL') == '-'
+    assert numbers.get_minus_sign_symbol('ar_EG') == '\u200e-'
+    assert numbers.get_minus_sign_symbol('ar_EG', numbering_system="default") == '\u061c-'
+    assert numbers.get_minus_sign_symbol('ar_EG', numbering_system="arab") == '\u061c-'
+    assert numbers.get_minus_sign_symbol('ar_EG', numbering_system="latn") == '\u200e-'
 
 
 def test_get_exponential_symbol():
     assert numbers.get_exponential_symbol('en_US') == 'E'
+    assert numbers.get_exponential_symbol('en_US', numbering_system="latn") == 'E'
+    assert numbers.get_exponential_symbol('en_US', numbering_system="default") == 'E'
+    assert numbers.get_exponential_symbol('ja_JP') == 'E'
+    assert numbers.get_exponential_symbol('ar_EG') == 'E'
+    assert numbers.get_exponential_symbol('ar_EG', numbering_system="default") == 'اس'
+    assert numbers.get_exponential_symbol('ar_EG', numbering_system="arab") == 'اس'
+    assert numbers.get_exponential_symbol('ar_EG', numbering_system="latn") == 'E'
 
 
 def test_get_group_symbol():
     assert numbers.get_group_symbol('en_US') == ','
+    assert numbers.get_group_symbol('en_US', numbering_system="latn") == ','
+    assert numbers.get_group_symbol('en_US', numbering_system="default") == ','
+    assert numbers.get_group_symbol('ar_EG') == ','
+    assert numbers.get_group_symbol('ar_EG', numbering_system="default") == '٬'
+    assert numbers.get_group_symbol('ar_EG', numbering_system="arab") == '٬'
+    assert numbers.get_group_symbol('ar_EG', numbering_system="latn") == ','
+
+
+def test_get_infinity_symbol():
+    assert numbers.get_infinity_symbol('en_US') == '∞'
+    assert numbers.get_infinity_symbol('ar_EG', numbering_system="latn") == '∞'
+    assert numbers.get_infinity_symbol('ar_EG', numbering_system="default") == '∞'
+    assert numbers.get_infinity_symbol('ar_EG', numbering_system="arab") == '∞'
 
 
 def test_decimal_precision():
@@ -356,6 +405,15 @@ def test_format_decimal():
     assert numbers.format_decimal(0000000.5, locale='en_US') == '0.5'
     assert numbers.format_decimal(000, locale='en_US') == '0'
 
+    assert numbers.format_decimal(12345.5, locale='ar_EG') == '12,345.5'
+    assert numbers.format_decimal(12345.5, locale='ar_EG', numbering_system="default") == '12٬345٫5'
+    assert numbers.format_decimal(12345.5, locale='ar_EG', numbering_system="arab") == '12٬345٫5'
+
+    with pytest.raises(numbers.UnsupportedNumberingSystemError):
+        numbers.format_decimal(12345.5, locale='en_US', numbering_system="unknown")
+
+
+
 
 @pytest.mark.parametrize('input_value, expected_value', [
     ('10000', '10,000'),
@@ -395,12 +453,16 @@ def test_format_decimal_quantization():
 def test_format_currency():
     assert (numbers.format_currency(1099.98, 'USD', locale='en_US')
             == '$1,099.98')
+    assert (numbers.format_currency(1099.98, 'USD', locale='en_US', numbering_system="default")
+            == '$1,099.98')
     assert (numbers.format_currency(0, 'USD', locale='en_US')
             == '$0.00')
     assert (numbers.format_currency(1099.98, 'USD', locale='es_CO')
             == 'US$1.099,98')
     assert (numbers.format_currency(1099.98, 'EUR', locale='de_DE')
             == '1.099,98\xa0\u20ac')
+    assert (numbers.format_currency(1099.98, 'USD', locale='ar_EG', numbering_system="default")
+            == '\u200f1٬099٫98\xa0US$')
     assert (numbers.format_currency(1099.98, 'EUR', '\xa4\xa4 #,##0.00',
                                     locale='en_US')
             == 'EUR 1,099.98')
@@ -454,6 +516,7 @@ def test_format_compact_currency():
     assert numbers.format_compact_currency(999, 'USD', locale='en_US', format_type="short") == '$999'
     assert numbers.format_compact_currency(123456789, 'USD', locale='en_US', format_type="short") == '$123M'
     assert numbers.format_compact_currency(123456789, 'USD', locale='en_US', fraction_digits=2, format_type="short") == '$123.46M'
+    assert numbers.format_compact_currency(123456789, 'USD', locale='en_US', fraction_digits=2, format_type="short", numbering_system="default") == '$123.46M'
     assert numbers.format_compact_currency(-123456789, 'USD', locale='en_US', fraction_digits=2, format_type="short") == '-$123.46M'
     assert numbers.format_compact_currency(1, 'JPY', locale='ja_JP', format_type="short") == '￥1'
     assert numbers.format_compact_currency(1234, 'JPY', locale='ja_JP', format_type="short") == '￥1234'
@@ -462,6 +525,7 @@ def test_format_compact_currency():
     assert numbers.format_compact_currency(123, 'EUR', locale='yav', format_type="short") == '€\xa0123'
     assert numbers.format_compact_currency(12345, 'EUR', locale='yav', format_type="short") == '€\xa012K'
     assert numbers.format_compact_currency(123456789, 'EUR', locale='de_DE', fraction_digits=1) == '123,5\xa0Mio.\xa0€'
+    assert numbers.format_compact_currency(123456789, 'USD', locale='ar_EG', fraction_digits=2, format_type="short", numbering_system="default") == '123٫46\xa0مليون\xa0US$'
 
 
 def test_format_compact_currency_invalid_format_type():
@@ -511,6 +575,10 @@ def test_format_currency_quantization():
 def test_format_currency_long_display_name():
     assert (numbers.format_currency(1099.98, 'USD', locale='en_US', format_type='name')
             == '1,099.98 US dollars')
+    assert (numbers.format_currency(1099.98, 'USD', locale='en_US', format_type='name', numbering_system="default")
+            == '1,099.98 US dollars')
+    assert (numbers.format_currency(1099.98, 'USD', locale='ar_EG', format_type='name', numbering_system="default")
+            == '1٬099٫98 دولار أمريكي')
     assert (numbers.format_currency(1.00, 'USD', locale='en_US', format_type='name')
             == '1.00 US dollar')
     assert (numbers.format_currency(1.00, 'EUR', locale='en_US', format_type='name')
@@ -556,6 +624,7 @@ def test_format_currency_long_display_name_custom_format():
 
 def test_format_percent():
     assert numbers.format_percent(0.34, locale='en_US') == '34%'
+    assert numbers.format_percent(0.34, locale='en_US', numbering_system="default") == '34%'
     assert numbers.format_percent(0, locale='en_US') == '0%'
     assert numbers.format_percent(0.34, '##0%', locale='en_US') == '34%'
     assert numbers.format_percent(34, '##0', locale='en_US') == '34'
@@ -564,6 +633,8 @@ def test_format_percent():
             == '2\xa0512\xa0%')
     assert (numbers.format_percent(25.1234, '#,##0\u2030', locale='en_US')
             == '25,123\u2030')
+    assert numbers.format_percent(134.5, locale='ar_EG', numbering_system="default") == '13٬450%'
+
 
 
 @pytest.mark.parametrize('input_value, expected_value', [
@@ -602,6 +673,7 @@ def test_format_percent_quantization():
 
 def test_format_scientific():
     assert numbers.format_scientific(10000, locale='en_US') == '1E4'
+    assert numbers.format_scientific(10000, locale='en_US', numbering_system="default") == '1E4'
     assert numbers.format_scientific(4234567, '#.#E0', locale='en_US') == '4.2E6'
     assert numbers.format_scientific(4234567, '0E0000', locale='en_US') == '4.234567E0006'
     assert numbers.format_scientific(4234567, '##0E00', locale='en_US') == '4.234567E06'
@@ -610,6 +682,7 @@ def test_format_scientific():
     assert numbers.format_scientific(4234567, '##0.#####E00', locale='en_US') == '4.23457E06'
     assert numbers.format_scientific(4234567, '##0.##E00', locale='en_US') == '4.23E06'
     assert numbers.format_scientific(42, '00000.000000E0000', locale='en_US') == '42000.000000E-0003'
+    assert numbers.format_scientific(0.2, locale="ar_EG", numbering_system="default") == '2اس\u061c-1'
 
 
 def test_default_scientific_format():
@@ -660,11 +733,15 @@ def test_format_scientific_quantization():
 def test_parse_number():
     assert numbers.parse_number('1,099', locale='en_US') == 1099
     assert numbers.parse_number('1.099', locale='de_DE') == 1099
+    assert numbers.parse_number('1٬099', locale='ar_EG', numbering_system="default") == 1099
 
     with pytest.raises(numbers.NumberFormatError) as excinfo:
         numbers.parse_number('1.099,98', locale='de')
     assert excinfo.value.args[0] == "'1.099,98' is not a valid number"
 
+    with pytest.raises(numbers.UnsupportedNumberingSystemError):
+        numbers.parse_number('1.099,98', locale='en', numbering_system="unsupported")
+
 
 def test_parse_decimal():
     assert (numbers.parse_decimal('1,099.98', locale='en_US')
diff --git a/tests/test_smoke.py b/tests/test_smoke.py
index c91684534..c36151e7e 100644
--- a/tests/test_smoke.py
+++ b/tests/test_smoke.py
@@ -43,9 +43,13 @@ def test_smoke_numbers(locale):
     locale = Locale.parse(locale)
     for number in NUMBERS:
         assert numbers.format_decimal(number, locale=locale)
+        assert numbers.format_decimal(number, locale=locale, numbering_system="default")
         assert numbers.format_currency(number, "EUR", locale=locale)
+        assert numbers.format_currency(number, "EUR", locale=locale, numbering_system="default")
         assert numbers.format_scientific(number, locale=locale)
+        assert numbers.format_scientific(number, locale=locale, numbering_system="default")
         assert numbers.format_percent(number / 100, locale=locale)
+        assert numbers.format_percent(number / 100, locale=locale, numbering_system="default")
 
 
 @pytest.mark.all_locales
@@ -54,3 +58,4 @@ def test_smoke_units(locale):
     for unit in ('length-meter', 'mass-kilogram', 'energy-calorie', 'volume-liter'):
         for number in NUMBERS:
             assert units.format_unit(number, measurement_unit=unit, locale=locale)
+            assert units.format_unit(number, measurement_unit=unit, locale=locale, numbering_system="default")
diff --git a/tests/test_support.py b/tests/test_support.py
index 92188a4cb..d0d1ac223 100644
--- a/tests/test_support.py
+++ b/tests/test_support.py
@@ -17,6 +17,7 @@
 import sys
 import tempfile
 import unittest
+from decimal import Decimal
 from io import BytesIO
 
 import pytest
@@ -296,16 +297,55 @@ def raise_attribute_error():
         assert str(exception.value) == 'message'
 
 
-WHEN = datetime.datetime(2007, 4, 1, 15, 30)
-
-def test_format_datetime(timezone_getter):
-    fmt = support.Format('en_US', tzinfo=timezone_getter('US/Eastern'))
-    assert fmt.datetime(WHEN) == 'Apr 1, 2007, 11:30:00\u202fAM'
-
-
-def test_format_time(timezone_getter):
-    fmt = support.Format('en_US', tzinfo=timezone_getter('US/Eastern'))
-    assert fmt.time(WHEN) == '11:30:00\u202fAM'
+class TestFormat:
+    def test_format_datetime(self, timezone_getter):
+        when = datetime.datetime(2007, 4, 1, 15, 30)
+        fmt = support.Format('en_US', tzinfo=timezone_getter('US/Eastern'))
+        assert fmt.datetime(when) == 'Apr 1, 2007, 11:30:00\u202fAM'
+
+    def test_format_time(self, timezone_getter):
+        when = datetime.datetime(2007, 4, 1, 15, 30)
+        fmt = support.Format('en_US', tzinfo=timezone_getter('US/Eastern'))
+        assert fmt.time(when) == '11:30:00\u202fAM'
+
+    def test_format_number(self):
+        assert support.Format('en_US').number(1234) == '1,234'
+        assert support.Format('ar_EG', numbering_system="default").number(1234) == '1٬234'
+
+    def test_format_decimal(self):
+        assert support.Format('en_US').decimal(1234.5) == '1,234.5'
+        assert support.Format('en_US').decimal(Decimal("1234.5")) == '1,234.5'
+        assert support.Format('ar_EG', numbering_system="default").decimal(1234.5) == '1٬234٫5'
+        assert support.Format('ar_EG', numbering_system="default").decimal(Decimal("1234.5")) == '1٬234٫5'
+
+    def test_format_compact_decimal(self):
+        assert support.Format('en_US').compact_decimal(1234) == '1K'
+        assert support.Format('ar_EG', numbering_system="default").compact_decimal(
+            1234, fraction_digits=1) == '1٫2\xa0ألف'
+        assert support.Format('ar_EG', numbering_system="default").compact_decimal(
+            Decimal("1234"), fraction_digits=1) == '1٫2\xa0ألف'
+
+    def test_format_currency(self):
+        assert support.Format('en_US').currency(1099.98, 'USD') == '$1,099.98'
+        assert support.Format('en_US').currency(Decimal("1099.98"), 'USD') == '$1,099.98'
+        assert support.Format('ar_EG', numbering_system="default").currency(
+            1099.98, 'EGP') == '\u200f1٬099٫98\xa0ج.م.\u200f'
+
+    def test_format_compact_currency(self):
+        assert support.Format('en_US').compact_currency(1099.98, 'USD') == '$1K'
+        assert support.Format('en_US').compact_currency(Decimal("1099.98"), 'USD') == '$1K'
+        assert support.Format('ar_EG', numbering_system="default").compact_currency(
+            1099.98, 'EGP') == '1\xa0ألف\xa0ج.م.\u200f'
+
+    def test_format_percent(self):
+        assert support.Format('en_US').percent(0.34) == '34%'
+        assert support.Format('en_US').percent(Decimal("0.34")) == '34%'
+        assert support.Format('ar_EG', numbering_system="default").percent(134.5) == '13٬450%'
+
+    def test_format_scientific(self):
+        assert support.Format('en_US').scientific(10000) == '1E4'
+        assert support.Format('en_US').scientific(Decimal("10000")) == '1E4'
+        assert support.Format('ar_EG', numbering_system="default").scientific(10000) == '1اس4'
 
 
 def test_lazy_proxy():

From 648bddba350097348e9c739edcf07e4e2051bae9 Mon Sep 17 00:00:00 2001
From: Aarni Koskela <akx@iki.fi>
Date: Tue, 28 Nov 2023 10:38:12 +0200
Subject: [PATCH 2/3] Apply ruff autofixes

---
 babel/numbers.py      | 16 ++++++++--------
 babel/units.py        |  6 +++---
 tests/test_numbers.py |  4 ++--
 3 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/babel/numbers.py b/babel/numbers.py
index a9c19510d..89cf60e15 100644
--- a/babel/numbers.py
+++ b/babel/numbers.py
@@ -327,7 +327,7 @@ def _get_numbering_system(locale: Locale, numbering_system: Literal["default"] |
 def _get_number_symbols(
     locale: Locale | str,
     *,
-    numbering_system: Literal["default"] | str = "latn"
+    numbering_system: Literal["default"] | str = "latn",
 ) -> LocaleDataDict:
     parsed_locale = Locale.parse(locale)
     numbering_system = _get_numbering_system(parsed_locale, numbering_system)
@@ -798,7 +798,7 @@ def _format_currency_long_name(
     decimal_quantization: bool = True,
     group_separator: bool = True,
     *,
-    numbering_system: Literal["default"] | str = "latn"
+    numbering_system: Literal["default"] | str = "latn",
 ) -> str:
     # Algorithm described here:
     # https://www.unicode.org/reports/tr35/tr35-numbers.html#Currencies
@@ -889,7 +889,7 @@ def format_percent(
     decimal_quantization: bool = True,
     group_separator: bool = True,
     *,
-    numbering_system: Literal["default"] | str = "latn"
+    numbering_system: Literal["default"] | str = "latn",
 ) -> str:
     """Return formatted percent value for a specific locale.
 
@@ -939,7 +939,7 @@ def format_percent(
     pattern = parse_pattern(format)
     return pattern.apply(
         number, locale, decimal_quantization=decimal_quantization, group_separator=group_separator,
-        numbering_system=numbering_system
+        numbering_system=numbering_system,
     )
 
 
@@ -949,7 +949,7 @@ def format_scientific(
         locale: Locale | str | None = LC_NUMERIC,
         decimal_quantization: bool = True,
         *,
-        numbering_system: Literal["default"] | str = "latn"
+        numbering_system: Literal["default"] | str = "latn",
 ) -> str:
     """Return value formatted in scientific notation for a specific locale.
 
@@ -1114,7 +1114,7 @@ def parse_decimal(
                     parsed_alt,
                     locale=locale,
                     decimal_quantization=False,
-                    numbering_system=numbering_system
+                    numbering_system=numbering_system,
                 )
                 if proper_alt == proper:
                     raise NumberFormatError(
@@ -1275,7 +1275,7 @@ def scientific_notation_elements(
         self,
         value: decimal.Decimal,
         locale: Locale | str | None,
-        numbering_system: str
+        numbering_system: str,
     ) -> tuple[decimal.Decimal, int, str]:
         """ Returns normalized scientific notation components of a value.
         """
@@ -1313,7 +1313,7 @@ def apply(
         force_frac: tuple[int, int] | None = None,
         group_separator: bool = True,
         *,
-        numbering_system: Literal["default"] | str = "latn"
+        numbering_system: Literal["default"] | str = "latn",
     ):
         """Renders into a string a number following the defined pattern.
 
diff --git a/babel/units.py b/babel/units.py
index 67f09299a..f676bbdc2 100644
--- a/babel/units.py
+++ b/babel/units.py
@@ -82,7 +82,7 @@ def format_unit(
     format: str | None = None,
     locale: Locale | str | None = LC_NUMERIC,
     *,
-    numbering_system: Literal["default"] | str = "latn"
+    numbering_system: Literal["default"] | str = "latn",
 ) -> str:
     """Format a value of a given unit.
 
@@ -219,7 +219,7 @@ def format_compound_unit(
     format: str | None = None,
     locale: Locale | str | None = LC_NUMERIC,
     *,
-    numbering_system: Literal["default"] | str = "latn"
+    numbering_system: Literal["default"] | str = "latn",
 ) -> str | None:
     """
     Format a compound number value, i.e. "kilometers per hour" or similar.
@@ -334,7 +334,7 @@ def format_compound_unit(
             denominator_value,
             format=format,
             locale=locale,
-            numbering_system=numbering_system
+            numbering_system=numbering_system,
         )
 
     # TODO: this doesn't support "compound_variations" (or "prefix"), and will fall back to the "x/y" representation
diff --git a/tests/test_numbers.py b/tests/test_numbers.py
index 1eb001bcc..7e4df672c 100644
--- a/tests/test_numbers.py
+++ b/tests/test_numbers.py
@@ -177,10 +177,10 @@ def test_compact(self):
         assert numbers.format_compact_decimal(1000, locale='fr', format_type='long') == 'mille'
         assert numbers.format_compact_decimal(1234, locale='fr', format_type='long') == '1 millier'
         assert numbers.format_compact_decimal(
-            12345, format_type="short", locale='ar_EG', fraction_digits=2, numbering_system='default'
+            12345, format_type="short", locale='ar_EG', fraction_digits=2, numbering_system='default',
         ) == '12٫34\xa0ألف'
         assert numbers.format_compact_decimal(
-            12345, format_type="short", locale='ar_EG', fraction_digits=2, numbering_system='latn'
+            12345, format_type="short", locale='ar_EG', fraction_digits=2, numbering_system='latn',
         ) == '12.34\xa0ألف'
 
 

From abe6bdafd48339f2770a3186723434b4afe77de8 Mon Sep 17 00:00:00 2001
From: Aarni Koskela <akx@iki.fi>
Date: Tue, 28 Nov 2023 11:08:34 +0200
Subject: [PATCH 3/3] Apply suggestions from code review

---
 babel/numbers.py      | 28 ++++++++++++++++++++--------
 babel/support.py      |  2 +-
 babel/units.py        |  2 +-
 tests/test_numbers.py |  4 ----
 4 files changed, 22 insertions(+), 14 deletions(-)

diff --git a/babel/numbers.py b/babel/numbers.py
index 89cf60e15..01f1ca70e 100644
--- a/babel/numbers.py
+++ b/babel/numbers.py
@@ -325,7 +325,7 @@ def _get_numbering_system(locale: Locale, numbering_system: Literal["default"] |
 
 
 def _get_number_symbols(
-    locale: Locale | str,
+    locale: Locale | str | None,
     *,
     numbering_system: Literal["default"] | str = "latn",
 ) -> LocaleDataDict:
@@ -1275,7 +1275,8 @@ def scientific_notation_elements(
         self,
         value: decimal.Decimal,
         locale: Locale | str | None,
-        numbering_system: str,
+        *,
+        numbering_system: Literal["default"] | str = "latn",
     ) -> tuple[decimal.Decimal, int, str]:
         """ Returns normalized scientific notation components of a value.
         """
@@ -1337,8 +1338,8 @@ def apply(
         :type decimal_quantization: bool
         :param force_frac: DEPRECATED - a forced override for `self.frac_prec`
                            for a single formatting invocation.
-        :param numbering_system: The numbering system used for formatting number symbols. Defaults to "latn", special
-                                 value "default" will use the default numbering system of the locale.
+        :param numbering_system: The numbering system used for formatting number symbols. Defaults to "latn".
+                                 The special value "default" will use the default numbering system of the locale.
         :return: Formatted decimal string.
         :rtype: str
         :raise UnsupportedNumberingSystemError: If the numbering system is not supported by the locale.
@@ -1458,7 +1459,15 @@ def _format_significant(self, value: decimal.Decimal, minimum: int, maximum: int
             ).rstrip('.')
         return result
 
-    def _format_int(self, value: str, min: int, max: int, locale: Locale | str | None, numbering_system: str) -> str:
+    def _format_int(
+        self,
+        value: str,
+        min: int,
+        max: int,
+        locale: Locale | str | None,
+        *,
+        numbering_system: Literal["default"] | str,
+    ) -> str:
         width = len(value)
         if width < min:
             value = '0' * (min - width) + value
@@ -1475,8 +1484,10 @@ def _quantize_value(
         self,
         value: decimal.Decimal,
         locale: Locale | str | None,
-        frac_prec: tuple[int, int], group_separator: bool,
-        numbering_system: str,
+        frac_prec: tuple[int, int],
+        group_separator: bool,
+        *,
+        numbering_system: Literal["default"] | str,
     ) -> str:
         # If the number is +/-Infinity, we can't quantize it
         if value.is_infinite():
@@ -1493,9 +1504,10 @@ def _quantize_value(
     def _format_frac(
         self,
         value: str,
-        numbering_system: str,
         locale: Locale | str | None,
         force_frac: tuple[int, int] | None = None,
+        *,
+        numbering_system: Literal["default"] | str,
     ) -> str:
         min, max = force_frac or self.frac_prec
         if len(value) < min:
diff --git a/babel/support.py b/babel/support.py
index dd5c996f3..1774d9d85 100644
--- a/babel/support.py
+++ b/babel/support.py
@@ -53,6 +53,7 @@ def __init__(
         self,
         locale: Locale | str,
         tzinfo: datetime.tzinfo | None = None,
+        *,
         numbering_system: Literal["default"] | str = "latn",
     ) -> None:
         """Initialize the formatter.
@@ -61,7 +62,6 @@ def __init__(
         :param tzinfo: the time-zone info (a `tzinfo` instance or `None`)
         :param numbering_system: The numbering system used for formatting number symbols. Defaults to "latn".
                                  The special value "default" will use the default numbering system of the locale.
-        :raise `UnsupportedNumberingSystemError`: If the numbering system is not supported by the locale.
         """
         self.locale = Locale.parse(locale)
         self.tzinfo = tzinfo
diff --git a/babel/units.py b/babel/units.py
index f676bbdc2..36206d0c8 100644
--- a/babel/units.py
+++ b/babel/units.py
@@ -239,7 +239,7 @@ def format_compound_unit(
     >>> format_compound_unit(32.5, "ton", 15, denominator_unit="hour", locale="en")
     '32.5 tons per 15 hours'
 
-    >>> format_compound_unit(1234.5, "ton", 15, denominator_unit="hour", locale="ar_EG", numbering_system="default")
+    >>> format_compound_unit(1234.5, "ton", 15, denominator_unit="hour", locale="ar_EG", numbering_system="arab")
     '1٬234٫5 طن لكل 15 ساعة'
 
     >>> format_compound_unit(160, denominator_unit="square-meter", locale="fr")
diff --git a/tests/test_numbers.py b/tests/test_numbers.py
index 7e4df672c..5d9830bd5 100644
--- a/tests/test_numbers.py
+++ b/tests/test_numbers.py
@@ -412,9 +412,6 @@ def test_format_decimal():
     with pytest.raises(numbers.UnsupportedNumberingSystemError):
         numbers.format_decimal(12345.5, locale='en_US', numbering_system="unknown")
 
-
-
-
 @pytest.mark.parametrize('input_value, expected_value', [
     ('10000', '10,000'),
     ('1', '1'),
@@ -742,7 +739,6 @@ def test_parse_number():
     with pytest.raises(numbers.UnsupportedNumberingSystemError):
         numbers.parse_number('1.099,98', locale='en', numbering_system="unsupported")
 
-
 def test_parse_decimal():
     assert (numbers.parse_decimal('1,099.98', locale='en_US')
             == decimal.Decimal('1099.98'))