import numpy as np
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import pytest
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import pandas as pd
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from pandas import (
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DataFrame,
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DatetimeIndex,
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Index,
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Series,
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date_range,
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)
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import pandas._testing as tm
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class TestDataFrameTruncate:
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def test_truncate(self, datetime_frame, frame_or_series):
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ts = datetime_frame[::3]
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ts = tm.get_obj(ts, frame_or_series)
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start, end = datetime_frame.index[3], datetime_frame.index[6]
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start_missing = datetime_frame.index[2]
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end_missing = datetime_frame.index[7]
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# neither specified
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truncated = ts.truncate()
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tm.assert_equal(truncated, ts)
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# both specified
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expected = ts[1:3]
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truncated = ts.truncate(start, end)
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tm.assert_equal(truncated, expected)
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truncated = ts.truncate(start_missing, end_missing)
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tm.assert_equal(truncated, expected)
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# start specified
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expected = ts[1:]
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truncated = ts.truncate(before=start)
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tm.assert_equal(truncated, expected)
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truncated = ts.truncate(before=start_missing)
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tm.assert_equal(truncated, expected)
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# end specified
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expected = ts[:3]
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truncated = ts.truncate(after=end)
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tm.assert_equal(truncated, expected)
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truncated = ts.truncate(after=end_missing)
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tm.assert_equal(truncated, expected)
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# corner case, empty series/frame returned
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truncated = ts.truncate(after=ts.index[0] - ts.index.freq)
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assert len(truncated) == 0
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truncated = ts.truncate(before=ts.index[-1] + ts.index.freq)
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assert len(truncated) == 0
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msg = "Truncate: 2000-01-06 00:00:00 must be after 2000-02-04 00:00:00"
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with pytest.raises(ValueError, match=msg):
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ts.truncate(
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before=ts.index[-1] - ts.index.freq, after=ts.index[0] + ts.index.freq
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)
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def test_truncate_nonsortedindex(self, frame_or_series):
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# GH#17935
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obj = DataFrame({"A": ["a", "b", "c", "d", "e"]}, index=[5, 3, 2, 9, 0])
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obj = tm.get_obj(obj, frame_or_series)
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msg = "truncate requires a sorted index"
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with pytest.raises(ValueError, match=msg):
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obj.truncate(before=3, after=9)
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def test_sort_values_nonsortedindex(self):
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rng = date_range("2011-01-01", "2012-01-01", freq="W")
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ts = DataFrame(
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{"A": np.random.randn(len(rng)), "B": np.random.randn(len(rng))}, index=rng
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)
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decreasing = ts.sort_values("A", ascending=False)
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msg = "truncate requires a sorted index"
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with pytest.raises(ValueError, match=msg):
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decreasing.truncate(before="2011-11", after="2011-12")
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def test_truncate_nonsortedindex_axis1(self):
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# GH#17935
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df = DataFrame(
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{
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3: np.random.randn(5),
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20: np.random.randn(5),
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2: np.random.randn(5),
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0: np.random.randn(5),
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},
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columns=[3, 20, 2, 0],
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)
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msg = "truncate requires a sorted index"
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with pytest.raises(ValueError, match=msg):
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df.truncate(before=2, after=20, axis=1)
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@pytest.mark.parametrize(
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"before, after, indices",
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[(1, 2, [2, 1]), (None, 2, [2, 1, 0]), (1, None, [3, 2, 1])],
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)
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@pytest.mark.parametrize("dtyp", [*tm.ALL_REAL_NUMPY_DTYPES, "datetime64[ns]"])
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def test_truncate_decreasing_index(
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self, before, after, indices, dtyp, frame_or_series
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):
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# https://github.com/pandas-dev/pandas/issues/33756
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idx = Index([3, 2, 1, 0], dtype=dtyp)
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if isinstance(idx, DatetimeIndex):
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before = pd.Timestamp(before) if before is not None else None
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after = pd.Timestamp(after) if after is not None else None
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indices = [pd.Timestamp(i) for i in indices]
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values = frame_or_series(range(len(idx)), index=idx)
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result = values.truncate(before=before, after=after)
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expected = values.loc[indices]
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tm.assert_equal(result, expected)
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def test_truncate_multiindex(self, frame_or_series):
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# GH 34564
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mi = pd.MultiIndex.from_product([[1, 2, 3, 4], ["A", "B"]], names=["L1", "L2"])
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s1 = DataFrame(range(mi.shape[0]), index=mi, columns=["col"])
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s1 = tm.get_obj(s1, frame_or_series)
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result = s1.truncate(before=2, after=3)
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df = DataFrame.from_dict(
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{"L1": [2, 2, 3, 3], "L2": ["A", "B", "A", "B"], "col": [2, 3, 4, 5]}
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)
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expected = df.set_index(["L1", "L2"])
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expected = tm.get_obj(expected, frame_or_series)
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tm.assert_equal(result, expected)
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def test_truncate_index_only_one_unique_value(self, frame_or_series):
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# GH 42365
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obj = Series(0, index=date_range("2021-06-30", "2021-06-30")).repeat(5)
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if frame_or_series is DataFrame:
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obj = obj.to_frame(name="a")
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truncated = obj.truncate("2021-06-28", "2021-07-01")
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tm.assert_equal(truncated, obj)
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