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from datetime import timedelta
from pandas import (
Index,
Timestamp,
date_range,
isna,
)
class TestAsOf:
def test_asof_partial(self):
index = date_range("2010-01-01", periods=2, freq="ME")
expected = Timestamp("2010-02-28")
result = index.asof("2010-02")
assert result == expected
assert not isinstance(result, Index)
def test_asof(self):
index = date_range("2020-01-01", periods=10)
dt = index[0]
assert index.asof(dt) == dt
assert isna(index.asof(dt - timedelta(1)))
dt = index[-1]
assert index.asof(dt + timedelta(1)) == dt
dt = index[0].to_pydatetime()
assert isinstance(index.asof(dt), Timestamp)