Added astronomical_length_scale_conversion.py (TheAlgorithms#7183)

Author: Claudiocli

conversions/astronomical_length_scale_conversion.py

@@ -0,0 +1,104 @@
+"""
+Conversion of length units.
+Available Units:
+Metre, Kilometre, Megametre, Gigametre,
+Terametre, Petametre, Exametre, Zettametre, Yottametre
+
+USAGE :
+-> Import this file into their respective project.
+-> Use the function length_conversion() for conversion of length units.
+-> Parameters :
+    -> value : The number of from units you want to convert
+    -> from_type : From which type you want to convert
+    -> to_type : To which type you want to convert
+
+REFERENCES :
+-> Wikipedia reference: https://en.wikipedia.org/wiki/Meter
+-> Wikipedia reference: https://en.wikipedia.org/wiki/Kilometer
+-> Wikipedia reference: https://en.wikipedia.org/wiki/Orders_of_magnitude_(length)
+"""
+
+UNIT_SYMBOL = {
+    "meter": "m",
+    "kilometer": "km",
+    "megametre": "Mm",
+    "gigametre": "Gm",
+    "terametre": "Tm",
+    "petametre": "Pm",
+    "exametre": "Em",
+    "zettametre": "Zm",
+    "yottametre": "Ym",
+}
+# Exponent of the factor(meter)
+METRIC_CONVERSION = {
+    "m": 0,
+    "km": 3,
+    "Mm": 6,
+    "Gm": 9,
+    "Tm": 12,
+    "Pm": 15,
+    "Em": 18,
+    "Zm": 21,
+    "Ym": 24,
+}
+
+
+def length_conversion(value: float, from_type: str, to_type: str) -> float:
+    """
+    Conversion between astronomical length units.
+
+    >>> length_conversion(1, "meter", "kilometer")
+    0.001
+    >>> length_conversion(1, "meter", "megametre")
+    1e-06
+    >>> length_conversion(1, "gigametre", "meter")
+    1000000000
+    >>> length_conversion(1, "gigametre", "terametre")
+    0.001
+    >>> length_conversion(1, "petametre", "terametre")
+    1000
+    >>> length_conversion(1, "petametre", "exametre")
+    0.001
+    >>> length_conversion(1, "terametre", "zettametre")
+    1e-09
+    >>> length_conversion(1, "yottametre", "zettametre")
+    1000
+    >>> length_conversion(4, "wrongUnit", "inch")
+    Traceback (most recent call last):
+      ...
+    ValueError: Invalid 'from_type' value: 'wrongUnit'.
+    Conversion abbreviations are: m, km, Mm, Gm, Tm, Pm, Em, Zm, Ym
+    """
+
+    from_sanitized = from_type.lower().strip("s")
+    to_sanitized = to_type.lower().strip("s")
+
+    from_sanitized = UNIT_SYMBOL.get(from_sanitized, from_sanitized)
+    to_sanitized = UNIT_SYMBOL.get(to_sanitized, to_sanitized)
+
+    if from_sanitized not in METRIC_CONVERSION:
+        raise ValueError(
+            f"Invalid 'from_type' value: {from_type!r}.\n"
+            f"Conversion abbreviations are: {', '.join(METRIC_CONVERSION)}"
+        )
+    if to_sanitized not in METRIC_CONVERSION:
+        raise ValueError(
+            f"Invalid 'to_type' value: {to_type!r}.\n"
+            f"Conversion abbreviations are: {', '.join(METRIC_CONVERSION)}"
+        )
+    from_exponent = METRIC_CONVERSION[from_sanitized]
+    to_exponent = METRIC_CONVERSION[to_sanitized]
+    exponent = 1
+
+    if from_exponent > to_exponent:
+        exponent = from_exponent - to_exponent
+    else:
+        exponent = -(to_exponent - from_exponent)
+
+    return value * pow(10, exponent)
+
+
+if __name__ == "__main__":
+    from doctest import testmod
+
+    testmod()