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from pandas import (
Index,
NaT,
date_range,
)
def test_is_monotonic_with_nat():
# GH#31437
# PeriodIndex.is_monotonic_increasing should behave analogously to DatetimeIndex,
# in particular never be monotonic when we have NaT
dti = date_range("2016-01-01", periods=3)
pi = dti.to_period("D")
tdi = Index(dti.view("timedelta64[ns]"))
for obj in [pi, pi._engine, dti, dti._engine, tdi, tdi._engine]:
if isinstance(obj, Index):
# i.e. not Engines
assert obj.is_monotonic_increasing
assert obj.is_monotonic_increasing
assert not obj.is_monotonic_decreasing
assert obj.is_unique
dti1 = dti.insert(0, NaT)
pi1 = dti1.to_period("D")
tdi1 = Index(dti1.view("timedelta64[ns]"))
for obj in [pi1, pi1._engine, dti1, dti1._engine, tdi1, tdi1._engine]:
if isinstance(obj, Index):
# i.e. not Engines
assert not obj.is_monotonic_increasing
assert not obj.is_monotonic_increasing
assert not obj.is_monotonic_decreasing
assert obj.is_unique
dti2 = dti.insert(3, NaT)
pi2 = dti2.to_period("H")
tdi2 = Index(dti2.view("timedelta64[ns]"))
for obj in [pi2, pi2._engine, dti2, dti2._engine, tdi2, tdi2._engine]:
if isinstance(obj, Index):
# i.e. not Engines
assert not obj.is_monotonic_increasing
assert not obj.is_monotonic_increasing
assert not obj.is_monotonic_decreasing
assert obj.is_unique