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Backport PR #27549 on branch 0.25.x (BUG: Fix interpolate ValueError for datetime64_tz index) #27560

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Merged
merged 1 commit into from
Jul 24, 2019
Merged

Backport PR #27549 on branch 0.25.x (BUG: Fix interpolate ValueError for datetime64_tz index) #27560

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2 changes: 1 addition & 1 deletion doc/source/whatsnew/v0.25.1.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -56,7 +56,7 @@ Timezones

Numeric
^^^^^^^
-
- Bug in :meth:`Series.interpolate` when using a timezone aware :class:`DatetimeIndex` (:issue:`27548`)
-
-

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3 changes: 1 addition & 2 deletions pandas/core/generic.py
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Expand Up @@ -30,7 +30,6 @@
is_bool,
is_bool_dtype,
is_datetime64_any_dtype,
is_datetime64_dtype,
is_datetime64tz_dtype,
is_dict_like,
is_extension_array_dtype,
Expand Down Expand Up @@ -7035,7 +7034,7 @@ def interpolate(
methods = {"index", "values", "nearest", "time"}
is_numeric_or_datetime = (
is_numeric_dtype(index)
or is_datetime64_dtype(index)
or is_datetime64_any_dtype(index)
or is_timedelta64_dtype(index)
)
if method not in methods and not is_numeric_or_datetime:
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14 changes: 10 additions & 4 deletions pandas/tests/series/test_missing.py
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Expand Up @@ -1518,10 +1518,16 @@ def test_interp_nonmono_raise(self):
s.interpolate(method="krogh")

@td.skip_if_no_scipy
def test_interp_datetime64(self):
df = Series([1, np.nan, 3], index=date_range("1/1/2000", periods=3))
result = df.interpolate(method="nearest")
expected = Series([1.0, 1.0, 3.0], index=date_range("1/1/2000", periods=3))
@pytest.mark.parametrize("method", ["nearest", "pad"])
def test_interp_datetime64(self, method, tz_naive_fixture):
df = Series(
[1, np.nan, 3], index=date_range("1/1/2000", periods=3, tz=tz_naive_fixture)
)
result = df.interpolate(method=method)
expected = Series(
[1.0, 1.0, 3.0],
index=date_range("1/1/2000", periods=3, tz=tz_naive_fixture),
)
assert_series_equal(result, expected)

def test_interp_limit_no_nans(self):
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