98 lines
3.5 KiB
Python
98 lines
3.5 KiB
Python
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import numpy as np
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import pytest
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from pandas import (
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Timedelta,
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timedelta_range,
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to_timedelta,
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)
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import pandas._testing as tm
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from pandas.tseries.offsets import (
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Day,
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Second,
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)
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class TestTimedeltas:
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def test_timedelta_range_unit(self):
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# GH#49824
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tdi = timedelta_range("0 Days", periods=10, freq="100000D", unit="s")
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exp_arr = (np.arange(10, dtype="i8") * 100_000).view("m8[D]").astype("m8[s]")
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tm.assert_numpy_array_equal(tdi.to_numpy(), exp_arr)
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def test_timedelta_range(self):
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expected = to_timedelta(np.arange(5), unit="D")
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result = timedelta_range("0 days", periods=5, freq="D")
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tm.assert_index_equal(result, expected)
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expected = to_timedelta(np.arange(11), unit="D")
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result = timedelta_range("0 days", "10 days", freq="D")
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tm.assert_index_equal(result, expected)
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expected = to_timedelta(np.arange(5), unit="D") + Second(2) + Day()
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result = timedelta_range("1 days, 00:00:02", "5 days, 00:00:02", freq="D")
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tm.assert_index_equal(result, expected)
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expected = to_timedelta([1, 3, 5, 7, 9], unit="D") + Second(2)
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result = timedelta_range("1 days, 00:00:02", periods=5, freq="2D")
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tm.assert_index_equal(result, expected)
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expected = to_timedelta(np.arange(50), unit="T") * 30
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result = timedelta_range("0 days", freq="30T", periods=50)
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tm.assert_index_equal(result, expected)
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@pytest.mark.parametrize(
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"periods, freq", [(3, "2D"), (5, "D"), (6, "19H12T"), (7, "16H"), (9, "12H")]
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)
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def test_linspace_behavior(self, periods, freq):
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# GH 20976
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result = timedelta_range(start="0 days", end="4 days", periods=periods)
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expected = timedelta_range(start="0 days", end="4 days", freq=freq)
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tm.assert_index_equal(result, expected)
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def test_errors(self):
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# not enough params
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msg = (
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"Of the four parameters: start, end, periods, and freq, "
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"exactly three must be specified"
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)
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with pytest.raises(ValueError, match=msg):
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timedelta_range(start="0 days")
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with pytest.raises(ValueError, match=msg):
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timedelta_range(end="5 days")
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with pytest.raises(ValueError, match=msg):
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timedelta_range(periods=2)
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with pytest.raises(ValueError, match=msg):
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timedelta_range()
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# too many params
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with pytest.raises(ValueError, match=msg):
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timedelta_range(start="0 days", end="5 days", periods=10, freq="H")
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@pytest.mark.parametrize(
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"start, end, freq, expected_periods",
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[
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("1D", "10D", "2D", (10 - 1) // 2 + 1),
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("2D", "30D", "3D", (30 - 2) // 3 + 1),
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("2s", "50s", "5s", (50 - 2) // 5 + 1),
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# tests that worked before GH 33498:
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("4D", "16D", "3D", (16 - 4) // 3 + 1),
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("8D", "16D", "40s", (16 * 3600 * 24 - 8 * 3600 * 24) // 40 + 1),
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],
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)
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def test_timedelta_range_freq_divide_end(self, start, end, freq, expected_periods):
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# GH 33498 only the cases where `(end % freq) == 0` used to fail
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res = timedelta_range(start=start, end=end, freq=freq)
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assert Timedelta(start) == res[0]
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assert Timedelta(end) >= res[-1]
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assert len(res) == expected_periods
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def test_timedelta_range_infer_freq(self):
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# https://github.com/pandas-dev/pandas/issues/35897
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result = timedelta_range("0s", "1s", periods=31)
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assert result.freq is None
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