from pandas import (
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Period,
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PeriodIndex,
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)
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def test_is_monotonic_increasing():
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# GH#17717
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p0 = Period("2017-09-01")
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p1 = Period("2017-09-02")
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p2 = Period("2017-09-03")
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idx_inc0 = PeriodIndex([p0, p1, p2])
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idx_inc1 = PeriodIndex([p0, p1, p1])
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idx_dec0 = PeriodIndex([p2, p1, p0])
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idx_dec1 = PeriodIndex([p2, p1, p1])
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idx = PeriodIndex([p1, p2, p0])
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assert idx_inc0.is_monotonic_increasing is True
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assert idx_inc1.is_monotonic_increasing is True
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assert idx_dec0.is_monotonic_increasing is False
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assert idx_dec1.is_monotonic_increasing is False
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assert idx.is_monotonic_increasing is False
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def test_is_monotonic_decreasing():
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# GH#17717
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p0 = Period("2017-09-01")
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p1 = Period("2017-09-02")
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p2 = Period("2017-09-03")
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idx_inc0 = PeriodIndex([p0, p1, p2])
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idx_inc1 = PeriodIndex([p0, p1, p1])
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idx_dec0 = PeriodIndex([p2, p1, p0])
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idx_dec1 = PeriodIndex([p2, p1, p1])
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idx = PeriodIndex([p1, p2, p0])
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assert idx_inc0.is_monotonic_decreasing is False
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assert idx_inc1.is_monotonic_decreasing is False
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assert idx_dec0.is_monotonic_decreasing is True
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assert idx_dec1.is_monotonic_decreasing is True
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assert idx.is_monotonic_decreasing is False
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