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