import numpy as np
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import pytest
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from pandas._libs.tslibs import IncompatibleFrequency
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from pandas import (
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Index,
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PeriodIndex,
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period_range,
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)
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import pandas._testing as tm
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class TestJoin:
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def test_join_outer_indexer(self):
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pi = period_range("1/1/2000", "1/20/2000", freq="D")
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result = pi._outer_indexer(pi)
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tm.assert_extension_array_equal(result[0], pi._values)
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tm.assert_numpy_array_equal(result[1], np.arange(len(pi), dtype=np.intp))
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tm.assert_numpy_array_equal(result[2], np.arange(len(pi), dtype=np.intp))
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def test_joins(self, join_type):
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index = period_range("1/1/2000", "1/20/2000", freq="D")
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joined = index.join(index[:-5], how=join_type)
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assert isinstance(joined, PeriodIndex)
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assert joined.freq == index.freq
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def test_join_self(self, join_type):
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index = period_range("1/1/2000", "1/20/2000", freq="D")
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res = index.join(index, how=join_type)
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assert index is res
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def test_join_does_not_recur(self):
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df = tm.makeCustomDataframe(
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3,
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2,
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data_gen_f=lambda *args: np.random.randint(2),
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c_idx_type="p",
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r_idx_type="dt",
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)
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ser = df.iloc[:2, 0]
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res = ser.index.join(df.columns, how="outer")
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expected = Index(
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[ser.index[0], ser.index[1], df.columns[0], df.columns[1]], object
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)
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tm.assert_index_equal(res, expected)
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def test_join_mismatched_freq_raises(self):
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index = period_range("1/1/2000", "1/20/2000", freq="D")
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index3 = period_range("1/1/2000", "1/20/2000", freq="2D")
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msg = r".*Input has different freq=2D from Period\(freq=D\)"
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with pytest.raises(IncompatibleFrequency, match=msg):
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index.join(index3)
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