8th day of python challenges 111-117
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abd.shallal
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"""
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Tests for DatetimeArray
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"""
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import operator
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import numpy as np
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import pytest
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from pandas.core.dtypes.dtypes import DatetimeTZDtype
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import pandas as pd
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from pandas.core.arrays import DatetimeArray
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from pandas.core.arrays.datetimes import sequence_to_dt64ns
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import pandas.util.testing as tm
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class TestDatetimeArrayConstructor:
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def test_only_1dim_accepted(self):
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arr = np.array([0, 1, 2, 3], dtype="M8[h]").astype("M8[ns]")
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with pytest.raises(ValueError, match="Only 1-dimensional"):
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# 2-dim
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DatetimeArray(arr.reshape(2, 2))
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with pytest.raises(ValueError, match="Only 1-dimensional"):
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# 0-dim
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DatetimeArray(arr[[0]].squeeze())
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def test_freq_validation(self):
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# GH#24623 check that invalid instances cannot be created with the
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# public constructor
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arr = np.arange(5, dtype=np.int64) * 3600 * 10 ** 9
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msg = (
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"Inferred frequency H from passed values does not "
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"conform to passed frequency W-SUN"
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)
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with pytest.raises(ValueError, match=msg):
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DatetimeArray(arr, freq="W")
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@pytest.mark.parametrize(
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"meth",
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[
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DatetimeArray._from_sequence,
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sequence_to_dt64ns,
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pd.to_datetime,
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pd.DatetimeIndex,
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],
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)
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def test_mixing_naive_tzaware_raises(self, meth):
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# GH#24569
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arr = np.array([pd.Timestamp("2000"), pd.Timestamp("2000", tz="CET")])
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msg = (
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"Cannot mix tz-aware with tz-naive values|"
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"Tz-aware datetime.datetime cannot be converted "
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"to datetime64 unless utc=True"
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)
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for obj in [arr, arr[::-1]]:
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# check that we raise regardless of whether naive is found
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# before aware or vice-versa
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with pytest.raises(ValueError, match=msg):
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meth(obj)
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def test_from_pandas_array(self):
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arr = pd.array(np.arange(5, dtype=np.int64)) * 3600 * 10 ** 9
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result = DatetimeArray._from_sequence(arr, freq="infer")
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expected = pd.date_range("1970-01-01", periods=5, freq="H")._data
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tm.assert_datetime_array_equal(result, expected)
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def test_mismatched_timezone_raises(self):
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arr = DatetimeArray(
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np.array(["2000-01-01T06:00:00"], dtype="M8[ns]"),
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dtype=DatetimeTZDtype(tz="US/Central"),
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)
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dtype = DatetimeTZDtype(tz="US/Eastern")
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with pytest.raises(TypeError, match="Timezone of the array"):
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DatetimeArray(arr, dtype=dtype)
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def test_non_array_raises(self):
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with pytest.raises(ValueError, match="list"):
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DatetimeArray([1, 2, 3])
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def test_other_type_raises(self):
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with pytest.raises(
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ValueError, match="The dtype of 'values' is incorrect.*bool"
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):
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DatetimeArray(np.array([1, 2, 3], dtype="bool"))
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def test_incorrect_dtype_raises(self):
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with pytest.raises(ValueError, match="Unexpected value for 'dtype'."):
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DatetimeArray(np.array([1, 2, 3], dtype="i8"), dtype="category")
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def test_freq_infer_raises(self):
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with pytest.raises(ValueError, match="Frequency inference"):
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DatetimeArray(np.array([1, 2, 3], dtype="i8"), freq="infer")
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def test_copy(self):
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data = np.array([1, 2, 3], dtype="M8[ns]")
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arr = DatetimeArray(data, copy=False)
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assert arr._data is data
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arr = DatetimeArray(data, copy=True)
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assert arr._data is not data
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class TestDatetimeArrayComparisons:
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# TODO: merge this into tests/arithmetic/test_datetime64 once it is
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# sufficiently robust
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def test_cmp_dt64_arraylike_tznaive(self, all_compare_operators):
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# arbitrary tz-naive DatetimeIndex
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opname = all_compare_operators.strip("_")
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op = getattr(operator, opname)
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dti = pd.date_range("2016-01-1", freq="MS", periods=9, tz=None)
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arr = DatetimeArray(dti)
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assert arr.freq == dti.freq
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assert arr.tz == dti.tz
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right = dti
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expected = np.ones(len(arr), dtype=bool)
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if opname in ["ne", "gt", "lt"]:
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# for these the comparisons should be all-False
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expected = ~expected
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result = op(arr, arr)
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tm.assert_numpy_array_equal(result, expected)
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for other in [right, np.array(right)]:
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# TODO: add list and tuple, and object-dtype once those
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# are fixed in the constructor
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result = op(arr, other)
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tm.assert_numpy_array_equal(result, expected)
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result = op(other, arr)
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tm.assert_numpy_array_equal(result, expected)
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class TestDatetimeArray:
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def test_astype_to_same(self):
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arr = DatetimeArray._from_sequence(["2000"], tz="US/Central")
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result = arr.astype(DatetimeTZDtype(tz="US/Central"), copy=False)
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assert result is arr
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@pytest.mark.parametrize("dtype", [int, np.int32, np.int64, "uint32", "uint64"])
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def test_astype_int(self, dtype):
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arr = DatetimeArray._from_sequence([pd.Timestamp("2000"), pd.Timestamp("2001")])
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result = arr.astype(dtype)
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if np.dtype(dtype).kind == "u":
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expected_dtype = np.dtype("uint64")
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else:
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expected_dtype = np.dtype("int64")
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expected = arr.astype(expected_dtype)
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assert result.dtype == expected_dtype
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tm.assert_numpy_array_equal(result, expected)
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def test_tz_setter_raises(self):
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arr = DatetimeArray._from_sequence(["2000"], tz="US/Central")
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with pytest.raises(AttributeError, match="tz_localize"):
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arr.tz = "UTC"
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def test_setitem_different_tz_raises(self):
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data = np.array([1, 2, 3], dtype="M8[ns]")
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arr = DatetimeArray(data, copy=False, dtype=DatetimeTZDtype(tz="US/Central"))
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with pytest.raises(ValueError, match="None"):
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arr[0] = pd.Timestamp("2000")
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with pytest.raises(ValueError, match="US/Central"):
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arr[0] = pd.Timestamp("2000", tz="US/Eastern")
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def test_setitem_clears_freq(self):
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a = DatetimeArray(pd.date_range("2000", periods=2, freq="D", tz="US/Central"))
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a[0] = pd.Timestamp("2000", tz="US/Central")
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assert a.freq is None
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def test_repeat_preserves_tz(self):
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dti = pd.date_range("2000", periods=2, freq="D", tz="US/Central")
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arr = DatetimeArray(dti)
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repeated = arr.repeat([1, 1])
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# preserves tz and values, but not freq
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expected = DatetimeArray(arr.asi8, freq=None, dtype=arr.dtype)
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tm.assert_equal(repeated, expected)
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def test_value_counts_preserves_tz(self):
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dti = pd.date_range("2000", periods=2, freq="D", tz="US/Central")
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arr = DatetimeArray(dti).repeat([4, 3])
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result = arr.value_counts()
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# Note: not tm.assert_index_equal, since `freq`s do not match
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assert result.index.equals(dti)
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arr[-2] = pd.NaT
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result = arr.value_counts()
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expected = pd.Series([1, 4, 2], index=[pd.NaT, dti[0], dti[1]])
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tm.assert_series_equal(result, expected)
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@pytest.mark.parametrize("method", ["pad", "backfill"])
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def test_fillna_preserves_tz(self, method):
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dti = pd.date_range("2000-01-01", periods=5, freq="D", tz="US/Central")
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arr = DatetimeArray(dti, copy=True)
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arr[2] = pd.NaT
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fill_val = dti[1] if method == "pad" else dti[3]
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expected = DatetimeArray._from_sequence(
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[dti[0], dti[1], fill_val, dti[3], dti[4]], freq=None, tz="US/Central"
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)
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result = arr.fillna(method=method)
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tm.assert_extension_array_equal(result, expected)
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# assert that arr and dti were not modified in-place
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assert arr[2] is pd.NaT
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assert dti[2] == pd.Timestamp("2000-01-03", tz="US/Central")
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def test_array_interface_tz(self):
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tz = "US/Central"
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data = DatetimeArray(pd.date_range("2017", periods=2, tz=tz))
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result = np.asarray(data)
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expected = np.array(
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[
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pd.Timestamp("2017-01-01T00:00:00", tz=tz),
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pd.Timestamp("2017-01-02T00:00:00", tz=tz),
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],
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dtype=object,
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)
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tm.assert_numpy_array_equal(result, expected)
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result = np.asarray(data, dtype=object)
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tm.assert_numpy_array_equal(result, expected)
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result = np.asarray(data, dtype="M8[ns]")
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expected = np.array(
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["2017-01-01T06:00:00", "2017-01-02T06:00:00"], dtype="M8[ns]"
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)
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tm.assert_numpy_array_equal(result, expected)
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def test_array_interface(self):
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data = DatetimeArray(pd.date_range("2017", periods=2))
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expected = np.array(
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["2017-01-01T00:00:00", "2017-01-02T00:00:00"], dtype="datetime64[ns]"
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)
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result = np.asarray(data)
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tm.assert_numpy_array_equal(result, expected)
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result = np.asarray(data, dtype=object)
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expected = np.array(
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[pd.Timestamp("2017-01-01T00:00:00"), pd.Timestamp("2017-01-02T00:00:00")],
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dtype=object,
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)
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tm.assert_numpy_array_equal(result, expected)
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class TestSequenceToDT64NS:
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def test_tz_dtype_mismatch_raises(self):
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arr = DatetimeArray._from_sequence(["2000"], tz="US/Central")
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with pytest.raises(TypeError, match="data is already tz-aware"):
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sequence_to_dt64ns(arr, dtype=DatetimeTZDtype(tz="UTC"))
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def test_tz_dtype_matches(self):
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arr = DatetimeArray._from_sequence(["2000"], tz="US/Central")
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result, _, _ = sequence_to_dt64ns(arr, dtype=DatetimeTZDtype(tz="US/Central"))
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tm.assert_numpy_array_equal(arr._data, result)
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class TestReductions:
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@pytest.mark.parametrize("tz", [None, "US/Central"])
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def test_min_max(self, tz):
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arr = DatetimeArray._from_sequence(
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[
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"2000-01-03",
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"2000-01-03",
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"NaT",
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"2000-01-02",
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"2000-01-05",
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"2000-01-04",
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],
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tz=tz,
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)
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result = arr.min()
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expected = pd.Timestamp("2000-01-02", tz=tz)
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assert result == expected
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result = arr.max()
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expected = pd.Timestamp("2000-01-05", tz=tz)
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assert result == expected
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result = arr.min(skipna=False)
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assert result is pd.NaT
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result = arr.max(skipna=False)
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assert result is pd.NaT
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@pytest.mark.parametrize("tz", [None, "US/Central"])
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@pytest.mark.parametrize("skipna", [True, False])
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def test_min_max_empty(self, skipna, tz):
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arr = DatetimeArray._from_sequence([], tz=tz)
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result = arr.min(skipna=skipna)
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assert result is pd.NaT
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result = arr.max(skipna=skipna)
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assert result is pd.NaT
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