import numpy as np
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import pytest
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from pandas import DataFrame
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import pandas._testing as tm
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class TestDataFrameReindexLike:
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def test_reindex_like(self, float_frame):
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other = float_frame.reindex(index=float_frame.index[:10], columns=["C", "B"])
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tm.assert_frame_equal(other, float_frame.reindex_like(other))
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@pytest.mark.parametrize(
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"method,expected_values",
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[
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("nearest", [0, 1, 1, 2]),
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("pad", [np.nan, 0, 1, 1]),
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("backfill", [0, 1, 2, 2]),
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],
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)
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def test_reindex_like_methods(self, method, expected_values):
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df = DataFrame({"x": list(range(5))})
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result = df.reindex_like(df, method=method, tolerance=0)
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tm.assert_frame_equal(df, result)
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result = df.reindex_like(df, method=method, tolerance=[0, 0, 0, 0])
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tm.assert_frame_equal(df, result)
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def test_reindex_like_subclass(self):
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# https://github.com/pandas-dev/pandas/issues/31925
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class MyDataFrame(DataFrame):
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pass
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expected = DataFrame()
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df = MyDataFrame()
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result = df.reindex_like(expected)
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tm.assert_frame_equal(result, expected)
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