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test_coding_times.py
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test_coding_times.py
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from __future__ import absolute_import, division, print_function
import warnings
from itertools import product
import numpy as np
import pandas as pd
import pytest
from xarray import DataArray, Variable, coding, decode_cf, set_options
from xarray.coding.times import (_import_cftime, decode_cf_datetime,
encode_cf_datetime)
from xarray.coding.variables import SerializationWarning
from xarray.core.common import contains_cftime_datetimes
from . import (
assert_array_equal, has_cftime, has_cftime_or_netCDF4, has_dask,
requires_cftime_or_netCDF4)
_NON_STANDARD_CALENDARS_SET = {'noleap', '365_day', '360_day',
'julian', 'all_leap', '366_day'}
_ALL_CALENDARS = sorted(_NON_STANDARD_CALENDARS_SET.union(
coding.times._STANDARD_CALENDARS))
_NON_STANDARD_CALENDARS = sorted(_NON_STANDARD_CALENDARS_SET)
_STANDARD_CALENDARS = sorted(coding.times._STANDARD_CALENDARS)
_CF_DATETIME_NUM_DATES_UNITS = [
(np.arange(10), 'days since 2000-01-01'),
(np.arange(10).astype('float64'), 'days since 2000-01-01'),
(np.arange(10).astype('float32'), 'days since 2000-01-01'),
(np.arange(10).reshape(2, 5), 'days since 2000-01-01'),
(12300 + np.arange(5), 'hours since 1680-01-01 00:00:00'),
# here we add a couple minor formatting errors to test
# the robustness of the parsing algorithm.
(12300 + np.arange(5), 'hour since 1680-01-01 00:00:00'),
(12300 + np.arange(5), u'Hour since 1680-01-01 00:00:00'),
(12300 + np.arange(5), ' Hour since 1680-01-01 00:00:00 '),
(10, 'days since 2000-01-01'),
([10], 'daYs since 2000-01-01'),
([[10]], 'days since 2000-01-01'),
([10, 10], 'days since 2000-01-01'),
(np.array(10), 'days since 2000-01-01'),
(0, 'days since 1000-01-01'),
([0], 'days since 1000-01-01'),
([[0]], 'days since 1000-01-01'),
(np.arange(2), 'days since 1000-01-01'),
(np.arange(0, 100000, 20000), 'days since 1900-01-01'),
(17093352.0, 'hours since 1-1-1 00:00:0.0'),
([0.5, 1.5], 'hours since 1900-01-01T00:00:00'),
(0, 'milliseconds since 2000-01-01T00:00:00'),
(0, 'microseconds since 2000-01-01T00:00:00'),
(np.int32(788961600), 'seconds since 1981-01-01') # GH2002
]
_CF_DATETIME_TESTS = [num_dates_units + (calendar,) for num_dates_units,
calendar in product(_CF_DATETIME_NUM_DATES_UNITS,
_STANDARD_CALENDARS)]
@np.vectorize
def _ensure_naive_tz(dt):
if hasattr(dt, 'tzinfo'):
return dt.replace(tzinfo=None)
else:
return dt
def _all_cftime_date_types():
try:
import cftime
except ImportError:
import netcdftime as cftime
return {'noleap': cftime.DatetimeNoLeap,
'365_day': cftime.DatetimeNoLeap,
'360_day': cftime.Datetime360Day,
'julian': cftime.DatetimeJulian,
'all_leap': cftime.DatetimeAllLeap,
'366_day': cftime.DatetimeAllLeap,
'gregorian': cftime.DatetimeGregorian,
'proleptic_gregorian': cftime.DatetimeProlepticGregorian}
@pytest.mark.skipif(not has_cftime_or_netCDF4, reason='cftime not installed')
@pytest.mark.parametrize(['num_dates', 'units', 'calendar'],
_CF_DATETIME_TESTS)
def test_cf_datetime(num_dates, units, calendar):
cftime = _import_cftime()
expected = _ensure_naive_tz(
cftime.num2date(num_dates, units, calendar))
with warnings.catch_warnings():
warnings.filterwarnings('ignore',
'Unable to decode time axis')
actual = coding.times.decode_cf_datetime(num_dates, units,
calendar)
if (isinstance(actual, np.ndarray) and
np.issubdtype(actual.dtype, np.datetime64)):
# self.assertEqual(actual.dtype.kind, 'M')
# For some reason, numpy 1.8 does not compare ns precision
# datetime64 arrays as equal to arrays of datetime objects,
# but it works for us precision. Thus, convert to us
# precision for the actual array equal comparison...
actual_cmp = actual.astype('M8[us]')
else:
actual_cmp = actual
assert_array_equal(expected, actual_cmp)
encoded, _, _ = coding.times.encode_cf_datetime(actual, units,
calendar)
if '1-1-1' not in units:
# pandas parses this date very strangely, so the original
# units/encoding cannot be preserved in this case:
# (Pdb) pd.to_datetime('1-1-1 00:00:0.0')
# Timestamp('2001-01-01 00:00:00')
assert_array_equal(num_dates, np.around(encoded, 1))
if (hasattr(num_dates, 'ndim') and num_dates.ndim == 1 and
'1000' not in units):
# verify that wrapping with a pandas.Index works
# note that it *does not* currently work to even put
# non-datetime64 compatible dates into a pandas.Index
encoded, _, _ = coding.times.encode_cf_datetime(
pd.Index(actual), units, calendar)
assert_array_equal(num_dates, np.around(encoded, 1))
@requires_cftime_or_netCDF4
def test_decode_cf_datetime_overflow():
# checks for
# https://github.com/pydata/pandas/issues/14068
# https://github.com/pydata/xarray/issues/975
from datetime import datetime
units = 'days since 2000-01-01 00:00:00'
# date after 2262 and before 1678
days = (-117608, 95795)
expected = (datetime(1677, 12, 31), datetime(2262, 4, 12))
for i, day in enumerate(days):
with warnings.catch_warnings():
warnings.filterwarnings('ignore', 'Unable to decode time axis')
result = coding.times.decode_cf_datetime(day, units)
assert result == expected[i]
def test_decode_cf_datetime_non_standard_units():
expected = pd.date_range(periods=100, start='1970-01-01', freq='h')
# netCDFs from madis.noaa.gov use this format for their time units
# they cannot be parsed by cftime, but pd.Timestamp works
units = 'hours since 1-1-1970'
actual = coding.times.decode_cf_datetime(np.arange(100), units)
assert_array_equal(actual, expected)
@requires_cftime_or_netCDF4
def test_decode_cf_datetime_non_iso_strings():
# datetime strings that are _almost_ ISO compliant but not quite,
# but which netCDF4.num2date can still parse correctly
expected = pd.date_range(periods=100, start='2000-01-01', freq='h')
cases = [(np.arange(100), 'hours since 2000-01-01 0'),
(np.arange(100), 'hours since 2000-1-1 0'),
(np.arange(100), 'hours since 2000-01-01 0:00')]
for num_dates, units in cases:
actual = coding.times.decode_cf_datetime(num_dates, units)
assert_array_equal(actual, expected)
@pytest.mark.skipif(not has_cftime_or_netCDF4, reason='cftime not installed')
@pytest.mark.parametrize(
['calendar', 'enable_cftimeindex'],
product(_STANDARD_CALENDARS, [False, True]))
def test_decode_standard_calendar_inside_timestamp_range(
calendar, enable_cftimeindex):
if enable_cftimeindex:
pytest.importorskip('cftime')
cftime = _import_cftime()
units = 'days since 0001-01-01'
times = pd.date_range('2001-04-01-00', end='2001-04-30-23',
freq='H')
noleap_time = cftime.date2num(times.to_pydatetime(), units,
calendar=calendar)
expected = times.values
expected_dtype = np.dtype('M8[ns]')
with warnings.catch_warnings():
warnings.filterwarnings('ignore', 'Unable to decode time axis')
actual = coding.times.decode_cf_datetime(
noleap_time, units, calendar=calendar,
enable_cftimeindex=enable_cftimeindex)
assert actual.dtype == expected_dtype
abs_diff = abs(actual - expected)
# once we no longer support versions of netCDF4 older than 1.1.5,
# we could do this check with near microsecond accuracy:
# https://github.com/Unidata/netcdf4-python/issues/355
assert (abs_diff <= np.timedelta64(1, 's')).all()
@pytest.mark.skipif(not has_cftime_or_netCDF4, reason='cftime not installed')
@pytest.mark.parametrize(
['calendar', 'enable_cftimeindex'],
product(_NON_STANDARD_CALENDARS, [False, True]))
def test_decode_non_standard_calendar_inside_timestamp_range(
calendar, enable_cftimeindex):
if enable_cftimeindex:
pytest.importorskip('cftime')
cftime = _import_cftime()
units = 'days since 0001-01-01'
times = pd.date_range('2001-04-01-00', end='2001-04-30-23',
freq='H')
noleap_time = cftime.date2num(times.to_pydatetime(), units,
calendar=calendar)
if enable_cftimeindex:
expected = cftime.num2date(noleap_time, units, calendar=calendar)
expected_dtype = np.dtype('O')
else:
expected = times.values
expected_dtype = np.dtype('M8[ns]')
with warnings.catch_warnings():
warnings.filterwarnings('ignore', 'Unable to decode time axis')
actual = coding.times.decode_cf_datetime(
noleap_time, units, calendar=calendar,
enable_cftimeindex=enable_cftimeindex)
assert actual.dtype == expected_dtype
abs_diff = abs(actual - expected)
# once we no longer support versions of netCDF4 older than 1.1.5,
# we could do this check with near microsecond accuracy:
# https://github.com/Unidata/netcdf4-python/issues/355
assert (abs_diff <= np.timedelta64(1, 's')).all()
@pytest.mark.skipif(not has_cftime_or_netCDF4, reason='cftime not installed')
@pytest.mark.parametrize(
['calendar', 'enable_cftimeindex'],
product(_ALL_CALENDARS, [False, True]))
def test_decode_dates_outside_timestamp_range(
calendar, enable_cftimeindex):
from datetime import datetime
if enable_cftimeindex:
pytest.importorskip('cftime')
cftime = _import_cftime()
units = 'days since 0001-01-01'
times = [datetime(1, 4, 1, h) for h in range(1, 5)]
noleap_time = cftime.date2num(times, units, calendar=calendar)
if enable_cftimeindex:
expected = cftime.num2date(noleap_time, units, calendar=calendar,
only_use_cftime_datetimes=True)
else:
expected = cftime.num2date(noleap_time, units, calendar=calendar)
expected_date_type = type(expected[0])
with warnings.catch_warnings():
warnings.filterwarnings('ignore', 'Unable to decode time axis')
actual = coding.times.decode_cf_datetime(
noleap_time, units, calendar=calendar,
enable_cftimeindex=enable_cftimeindex)
assert all(isinstance(value, expected_date_type) for value in actual)
abs_diff = abs(actual - expected)
# once we no longer support versions of netCDF4 older than 1.1.5,
# we could do this check with near microsecond accuracy:
# https://github.com/Unidata/netcdf4-python/issues/355
assert (abs_diff <= np.timedelta64(1, 's')).all()
@pytest.mark.skipif(not has_cftime_or_netCDF4, reason='cftime not installed')
@pytest.mark.parametrize(
['calendar', 'enable_cftimeindex'],
product(_STANDARD_CALENDARS, [False, True]))
def test_decode_standard_calendar_single_element_inside_timestamp_range(
calendar, enable_cftimeindex):
if enable_cftimeindex:
pytest.importorskip('cftime')
units = 'days since 0001-01-01'
for num_time in [735368, [735368], [[735368]]]:
with warnings.catch_warnings():
warnings.filterwarnings('ignore',
'Unable to decode time axis')
actual = coding.times.decode_cf_datetime(
num_time, units, calendar=calendar,
enable_cftimeindex=enable_cftimeindex)
assert actual.dtype == np.dtype('M8[ns]')
@pytest.mark.skipif(not has_cftime_or_netCDF4, reason='cftime not installed')
@pytest.mark.parametrize(
['calendar', 'enable_cftimeindex'],
product(_NON_STANDARD_CALENDARS, [False, True]))
def test_decode_non_standard_calendar_single_element_inside_timestamp_range(
calendar, enable_cftimeindex):
if enable_cftimeindex:
pytest.importorskip('cftime')
units = 'days since 0001-01-01'
for num_time in [735368, [735368], [[735368]]]:
with warnings.catch_warnings():
warnings.filterwarnings('ignore',
'Unable to decode time axis')
actual = coding.times.decode_cf_datetime(
num_time, units, calendar=calendar,
enable_cftimeindex=enable_cftimeindex)
if enable_cftimeindex:
assert actual.dtype == np.dtype('O')
else:
assert actual.dtype == np.dtype('M8[ns]')
@pytest.mark.skipif(not has_cftime_or_netCDF4, reason='cftime not installed')
@pytest.mark.parametrize(
['calendar', 'enable_cftimeindex'],
product(_NON_STANDARD_CALENDARS, [False, True]))
def test_decode_single_element_outside_timestamp_range(
calendar, enable_cftimeindex):
if enable_cftimeindex:
pytest.importorskip('cftime')
cftime = _import_cftime()
units = 'days since 0001-01-01'
for days in [1, 1470376]:
for num_time in [days, [days], [[days]]]:
with warnings.catch_warnings():
warnings.filterwarnings('ignore',
'Unable to decode time axis')
actual = coding.times.decode_cf_datetime(
num_time, units, calendar=calendar,
enable_cftimeindex=enable_cftimeindex)
expected = cftime.num2date(days, units, calendar)
assert isinstance(actual.item(), type(expected))
@pytest.mark.skipif(not has_cftime_or_netCDF4, reason='cftime not installed')
@pytest.mark.parametrize(
['calendar', 'enable_cftimeindex'],
product(_STANDARD_CALENDARS, [False, True]))
def test_decode_standard_calendar_multidim_time_inside_timestamp_range(
calendar, enable_cftimeindex):
if enable_cftimeindex:
pytest.importorskip('cftime')
cftime = _import_cftime()
units = 'days since 0001-01-01'
times1 = pd.date_range('2001-04-01', end='2001-04-05', freq='D')
times2 = pd.date_range('2001-05-01', end='2001-05-05', freq='D')
noleap_time1 = cftime.date2num(times1.to_pydatetime(),
units, calendar=calendar)
noleap_time2 = cftime.date2num(times2.to_pydatetime(),
units, calendar=calendar)
mdim_time = np.empty((len(noleap_time1), 2), )
mdim_time[:, 0] = noleap_time1
mdim_time[:, 1] = noleap_time2
expected1 = times1.values
expected2 = times2.values
actual = coding.times.decode_cf_datetime(
mdim_time, units, calendar=calendar,
enable_cftimeindex=enable_cftimeindex)
assert actual.dtype == np.dtype('M8[ns]')
abs_diff1 = abs(actual[:, 0] - expected1)
abs_diff2 = abs(actual[:, 1] - expected2)
# once we no longer support versions of netCDF4 older than 1.1.5,
# we could do this check with near microsecond accuracy:
# https://github.com/Unidata/netcdf4-python/issues/355
assert (abs_diff1 <= np.timedelta64(1, 's')).all()
assert (abs_diff2 <= np.timedelta64(1, 's')).all()
@pytest.mark.skipif(not has_cftime_or_netCDF4, reason='cftime not installed')
@pytest.mark.parametrize(
['calendar', 'enable_cftimeindex'],
product(_NON_STANDARD_CALENDARS, [False, True]))
def test_decode_nonstandard_calendar_multidim_time_inside_timestamp_range(
calendar, enable_cftimeindex):
if enable_cftimeindex:
pytest.importorskip('cftime')
cftime = _import_cftime()
units = 'days since 0001-01-01'
times1 = pd.date_range('2001-04-01', end='2001-04-05', freq='D')
times2 = pd.date_range('2001-05-01', end='2001-05-05', freq='D')
noleap_time1 = cftime.date2num(times1.to_pydatetime(),
units, calendar=calendar)
noleap_time2 = cftime.date2num(times2.to_pydatetime(),
units, calendar=calendar)
mdim_time = np.empty((len(noleap_time1), 2), )
mdim_time[:, 0] = noleap_time1
mdim_time[:, 1] = noleap_time2
if enable_cftimeindex:
expected1 = cftime.num2date(noleap_time1, units, calendar)
expected2 = cftime.num2date(noleap_time2, units, calendar)
expected_dtype = np.dtype('O')
else:
expected1 = times1.values
expected2 = times2.values
expected_dtype = np.dtype('M8[ns]')
actual = coding.times.decode_cf_datetime(
mdim_time, units, calendar=calendar,
enable_cftimeindex=enable_cftimeindex)
assert actual.dtype == expected_dtype
abs_diff1 = abs(actual[:, 0] - expected1)
abs_diff2 = abs(actual[:, 1] - expected2)
# once we no longer support versions of netCDF4 older than 1.1.5,
# we could do this check with near microsecond accuracy:
# https://github.com/Unidata/netcdf4-python/issues/355
assert (abs_diff1 <= np.timedelta64(1, 's')).all()
assert (abs_diff2 <= np.timedelta64(1, 's')).all()
@pytest.mark.skipif(not has_cftime_or_netCDF4, reason='cftime not installed')
@pytest.mark.parametrize(
['calendar', 'enable_cftimeindex'],
product(_ALL_CALENDARS, [False, True]))
def test_decode_multidim_time_outside_timestamp_range(
calendar, enable_cftimeindex):
from datetime import datetime
if enable_cftimeindex:
pytest.importorskip('cftime')
cftime = _import_cftime()
units = 'days since 0001-01-01'
times1 = [datetime(1, 4, day) for day in range(1, 6)]
times2 = [datetime(1, 5, day) for day in range(1, 6)]
noleap_time1 = cftime.date2num(times1, units, calendar=calendar)
noleap_time2 = cftime.date2num(times2, units, calendar=calendar)
mdim_time = np.empty((len(noleap_time1), 2), )
mdim_time[:, 0] = noleap_time1
mdim_time[:, 1] = noleap_time2
if enable_cftimeindex:
expected1 = cftime.num2date(noleap_time1, units, calendar,
only_use_cftime_datetimes=True)
expected2 = cftime.num2date(noleap_time2, units, calendar,
only_use_cftime_datetimes=True)
else:
expected1 = cftime.num2date(noleap_time1, units, calendar)
expected2 = cftime.num2date(noleap_time2, units, calendar)
with warnings.catch_warnings():
warnings.filterwarnings('ignore', 'Unable to decode time axis')
actual = coding.times.decode_cf_datetime(
mdim_time, units, calendar=calendar,
enable_cftimeindex=enable_cftimeindex)
assert actual.dtype == np.dtype('O')
abs_diff1 = abs(actual[:, 0] - expected1)
abs_diff2 = abs(actual[:, 1] - expected2)
# once we no longer support versions of netCDF4 older than 1.1.5,
# we could do this check with near microsecond accuracy:
# https://github.com/Unidata/netcdf4-python/issues/355
assert (abs_diff1 <= np.timedelta64(1, 's')).all()
assert (abs_diff2 <= np.timedelta64(1, 's')).all()
@pytest.mark.skipif(not has_cftime_or_netCDF4, reason='cftime not installed')
@pytest.mark.parametrize(
['calendar', 'enable_cftimeindex'],
product(['360_day', 'all_leap', '366_day'], [False, True]))
def test_decode_non_standard_calendar_single_element_fallback(
calendar, enable_cftimeindex):
if enable_cftimeindex:
pytest.importorskip('cftime')
cftime = _import_cftime()
units = 'days since 0001-01-01'
try:
dt = cftime.netcdftime.datetime(2001, 2, 29)
except AttributeError:
# Must be using standalone netcdftime library
dt = cftime.datetime(2001, 2, 29)
num_time = cftime.date2num(dt, units, calendar)
if enable_cftimeindex:
actual = coding.times.decode_cf_datetime(
num_time, units, calendar=calendar,
enable_cftimeindex=enable_cftimeindex)
else:
with pytest.warns(SerializationWarning,
match='Unable to decode time axis'):
actual = coding.times.decode_cf_datetime(
num_time, units, calendar=calendar,
enable_cftimeindex=enable_cftimeindex)
expected = np.asarray(cftime.num2date(num_time, units, calendar))
assert actual.dtype == np.dtype('O')
assert expected == actual
@pytest.mark.skipif(not has_cftime_or_netCDF4, reason='cftime not installed')
@pytest.mark.parametrize(
['calendar', 'enable_cftimeindex'],
product(['360_day'], [False, True]))
def test_decode_non_standard_calendar_fallback(
calendar, enable_cftimeindex):
if enable_cftimeindex:
pytest.importorskip('cftime')
cftime = _import_cftime()
# ensure leap year doesn't matter
for year in [2010, 2011, 2012, 2013, 2014]:
units = 'days since {0}-01-01'.format(year)
num_times = np.arange(100)
expected = cftime.num2date(num_times, units, calendar)
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('always')
actual = coding.times.decode_cf_datetime(
num_times, units, calendar=calendar,
enable_cftimeindex=enable_cftimeindex)
if enable_cftimeindex:
assert len(w) == 0
else:
assert len(w) == 1
assert 'Unable to decode time axis' in str(w[0].message)
assert actual.dtype == np.dtype('O')
assert_array_equal(actual, expected)
@pytest.mark.skipif(not has_cftime_or_netCDF4, reason='cftime not installed')
@pytest.mark.parametrize(
['num_dates', 'units', 'expected_list'],
[([np.nan], 'days since 2000-01-01', ['NaT']),
([np.nan, 0], 'days since 2000-01-01',
['NaT', '2000-01-01T00:00:00Z']),
([np.nan, 0, 1], 'days since 2000-01-01',
['NaT', '2000-01-01T00:00:00Z', '2000-01-02T00:00:00Z'])])
def test_cf_datetime_nan(num_dates, units, expected_list):
with warnings.catch_warnings():
warnings.filterwarnings('ignore', 'All-NaN')
actual = coding.times.decode_cf_datetime(num_dates, units)
# use pandas because numpy will deprecate timezone-aware conversions
expected = pd.to_datetime(expected_list)
assert_array_equal(expected, actual)
@requires_cftime_or_netCDF4
def test_decoded_cf_datetime_array_2d():
# regression test for GH1229
variable = Variable(('x', 'y'), np.array([[0, 1], [2, 3]]),
{'units': 'days since 2000-01-01'})
result = coding.times.CFDatetimeCoder().decode(variable)
assert result.dtype == 'datetime64[ns]'
expected = pd.date_range('2000-01-01', periods=4).values.reshape(2, 2)
assert_array_equal(np.asarray(result), expected)
@pytest.mark.parametrize(
['dates', 'expected'],
[(pd.date_range('1900-01-01', periods=5),
'days since 1900-01-01 00:00:00'),
(pd.date_range('1900-01-01 12:00:00', freq='H',
periods=2),
'hours since 1900-01-01 12:00:00'),
(pd.to_datetime(
['1900-01-01', '1900-01-02', 'NaT']),
'days since 1900-01-01 00:00:00'),
(pd.to_datetime(['1900-01-01',
'1900-01-02T00:00:00.005']),
'seconds since 1900-01-01 00:00:00'),
(pd.to_datetime(['NaT', '1900-01-01']),
'days since 1900-01-01 00:00:00'),
(pd.to_datetime(['NaT']),
'days since 1970-01-01 00:00:00')])
def test_infer_datetime_units(dates, expected):
assert expected == coding.times.infer_datetime_units(dates)
_CFTIME_DATETIME_UNITS_TESTS = [
([(1900, 1, 1), (1900, 1, 1)], 'days since 1900-01-01 00:00:00.000000'),
([(1900, 1, 1), (1900, 1, 2), (1900, 1, 2, 0, 0, 1)],
'seconds since 1900-01-01 00:00:00.000000'),
([(1900, 1, 1), (1900, 1, 8), (1900, 1, 16)],
'days since 1900-01-01 00:00:00.000000')
]
@pytest.mark.skipif(not has_cftime_or_netCDF4, reason='cftime not installed')
@pytest.mark.parametrize(
'calendar', _NON_STANDARD_CALENDARS + ['gregorian', 'proleptic_gregorian'])
@pytest.mark.parametrize(('date_args', 'expected'),
_CFTIME_DATETIME_UNITS_TESTS)
def test_infer_cftime_datetime_units(calendar, date_args, expected):
date_type = _all_cftime_date_types()[calendar]
dates = [date_type(*args) for args in date_args]
assert expected == coding.times.infer_datetime_units(dates)
@pytest.mark.parametrize(
['timedeltas', 'units', 'numbers'],
[('1D', 'days', np.int64(1)),
(['1D', '2D', '3D'], 'days', np.array([1, 2, 3], 'int64')),
('1h', 'hours', np.int64(1)),
('1ms', 'milliseconds', np.int64(1)),
('1us', 'microseconds', np.int64(1)),
(['NaT', '0s', '1s'], None, [np.nan, 0, 1]),
(['30m', '60m'], 'hours', [0.5, 1.0]),
(np.timedelta64('NaT', 'ns'), 'days', np.nan),
(['NaT', 'NaT'], 'days', [np.nan, np.nan])])
def test_cf_timedelta(timedeltas, units, numbers):
timedeltas = pd.to_timedelta(timedeltas, box=False)
numbers = np.array(numbers)
expected = numbers
actual, _ = coding.times.encode_cf_timedelta(timedeltas, units)
assert_array_equal(expected, actual)
assert expected.dtype == actual.dtype
if units is not None:
expected = timedeltas
actual = coding.times.decode_cf_timedelta(numbers, units)
assert_array_equal(expected, actual)
assert expected.dtype == actual.dtype
expected = np.timedelta64('NaT', 'ns')
actual = coding.times.decode_cf_timedelta(np.array(np.nan), 'days')
assert_array_equal(expected, actual)
def test_cf_timedelta_2d():
timedeltas = ['1D', '2D', '3D']
units = 'days'
numbers = np.atleast_2d([1, 2, 3])
timedeltas = np.atleast_2d(pd.to_timedelta(timedeltas, box=False))
expected = timedeltas
actual = coding.times.decode_cf_timedelta(numbers, units)
assert_array_equal(expected, actual)
assert expected.dtype == actual.dtype
@pytest.mark.parametrize(
['deltas', 'expected'],
[(pd.to_timedelta(['1 day', '2 days']), 'days'),
(pd.to_timedelta(['1h', '1 day 1 hour']), 'hours'),
(pd.to_timedelta(['1m', '2m', np.nan]), 'minutes'),
(pd.to_timedelta(['1m3s', '1m4s']), 'seconds')])
def test_infer_timedelta_units(deltas, expected):
assert expected == coding.times.infer_timedelta_units(deltas)
@pytest.mark.skipif(not has_cftime_or_netCDF4, reason='cftime not installed')
@pytest.mark.parametrize(['date_args', 'expected'],
[((1, 2, 3, 4, 5, 6),
'0001-02-03 04:05:06.000000'),
((10, 2, 3, 4, 5, 6),
'0010-02-03 04:05:06.000000'),
((100, 2, 3, 4, 5, 6),
'0100-02-03 04:05:06.000000'),
((1000, 2, 3, 4, 5, 6),
'1000-02-03 04:05:06.000000')])
def test_format_cftime_datetime(date_args, expected):
date_types = _all_cftime_date_types()
for date_type in date_types.values():
result = coding.times.format_cftime_datetime(date_type(*date_args))
assert result == expected
@pytest.mark.skipif(not has_cftime_or_netCDF4, reason='cftime not installed')
@pytest.mark.parametrize(
['calendar', 'enable_cftimeindex'],
product(_ALL_CALENDARS, [False, True]))
def test_decode_cf_enable_cftimeindex(calendar, enable_cftimeindex):
days = [1., 2., 3.]
da = DataArray(days, coords=[days], dims=['time'], name='test')
ds = da.to_dataset()
for v in ['test', 'time']:
ds[v].attrs['units'] = 'days since 2001-01-01'
ds[v].attrs['calendar'] = calendar
if (not has_cftime and enable_cftimeindex and
calendar not in _STANDARD_CALENDARS):
with pytest.raises(ValueError):
with set_options(enable_cftimeindex=enable_cftimeindex):
ds = decode_cf(ds)
else:
with set_options(enable_cftimeindex=enable_cftimeindex):
ds = decode_cf(ds)
if (enable_cftimeindex and
calendar not in _STANDARD_CALENDARS):
assert ds.test.dtype == np.dtype('O')
else:
assert ds.test.dtype == np.dtype('M8[ns]')
@pytest.fixture(params=_ALL_CALENDARS)
def calendar(request):
return request.param
@pytest.fixture()
def times(calendar):
cftime = _import_cftime()
return cftime.num2date(
np.arange(4), units='hours since 2000-01-01', calendar=calendar,
only_use_cftime_datetimes=True)
@pytest.fixture()
def data(times):
data = np.random.rand(2, 2, 4)
lons = np.linspace(0, 11, 2)
lats = np.linspace(0, 20, 2)
return DataArray(data, coords=[lons, lats, times],
dims=['lon', 'lat', 'time'], name='data')
@pytest.fixture()
def times_3d(times):
lons = np.linspace(0, 11, 2)
lats = np.linspace(0, 20, 2)
times_arr = np.random.choice(times, size=(2, 2, 4))
return DataArray(times_arr, coords=[lons, lats, times],
dims=['lon', 'lat', 'time'],
name='data')
@pytest.mark.skipif(not has_cftime, reason='cftime not installed')
def test_contains_cftime_datetimes_1d(data):
assert contains_cftime_datetimes(data.time)
@pytest.mark.skipif(not has_dask, reason='dask not installed')
@pytest.mark.skipif(not has_cftime, reason='cftime not installed')
def test_contains_cftime_datetimes_dask_1d(data):
assert contains_cftime_datetimes(data.time.chunk())
@pytest.mark.skipif(not has_cftime, reason='cftime not installed')
def test_contains_cftime_datetimes_3d(times_3d):
assert contains_cftime_datetimes(times_3d)
@pytest.mark.skipif(not has_dask, reason='dask not installed')
@pytest.mark.skipif(not has_cftime, reason='cftime not installed')
def test_contains_cftime_datetimes_dask_3d(times_3d):
assert contains_cftime_datetimes(times_3d.chunk())
@pytest.mark.parametrize('non_cftime_data', [DataArray([]), DataArray([1, 2])])
def test_contains_cftime_datetimes_non_cftimes(non_cftime_data):
assert not contains_cftime_datetimes(non_cftime_data)
@pytest.mark.skipif(not has_dask, reason='dask not installed')
@pytest.mark.parametrize('non_cftime_data', [DataArray([]), DataArray([1, 2])])
def test_contains_cftime_datetimes_non_cftimes_dask(non_cftime_data):
assert not contains_cftime_datetimes(non_cftime_data.chunk())
@pytest.mark.skipif(not has_cftime_or_netCDF4, reason='cftime not installed')
@pytest.mark.parametrize('shape', [(24,), (8, 3), (2, 4, 3)])
def test_encode_datetime_overflow(shape):
# Test for fix to GH 2272
dates = pd.date_range('2100', periods=24).values.reshape(shape)
units = 'days since 1800-01-01'
calendar = 'standard'
num, _, _ = encode_cf_datetime(dates, units, calendar)
roundtrip = decode_cf_datetime(num, units, calendar)
np.testing.assert_array_equal(dates, roundtrip)