Series.pow when right operand is missing value (#55568)

* fix pow with missing operand * move to 2.2.0 * Update doc/source/whatsnew/v2.2.0.rst Co-authored-by: Matthew Roeschke <[email protected]> --------- Co-authored-by: Rohan Jain <[email protected]> Co-authored-by: Matthew Roeschke <[email protected]>
pandas-dev · Oct 19, 2023 · 192aec7 · 192aec7
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diff --git a/doc/source/whatsnew/v2.2.0.rst b/doc/source/whatsnew/v2.2.0.rst
@@ -318,6 +318,7 @@ Timezones
 Numeric
 ^^^^^^^
 - Bug in :func:`read_csv` with ``engine="pyarrow"`` causing rounding errors for large integers (:issue:`52505`)
+- Bug in :meth:`Series.pow` not filling missing values correctly (:issue:`55512`)
 -
 
 Conversion

diff --git a/pandas/core/series.py b/pandas/core/series.py
@@ -6043,6 +6043,8 @@ def _flex_method(self, other, op, *, level=None, fill_value=None, axis: Axis = 0
             return result
         else:
             if fill_value is not None:
+                if isna(other):
+                    return op(self, fill_value)
                 self = self.fillna(fill_value)
 
             return op(self, other)

diff --git a/pandas/tests/extension/test_arrow.py b/pandas/tests/extension/test_arrow.py
@@ -3017,6 +3017,14 @@ def test_arrowextensiondtype_dataframe_repr():
     assert result == expected
 
 
+def test_pow_missing_operand():
+    # GH 55512
+    k = pd.Series([2, None], dtype="int64[pyarrow]")
+    result = k.pow(None, fill_value=3)
+    expected = pd.Series([8, None], dtype="int64[pyarrow]")
+    tm.assert_series_equal(result, expected)
+
+
 @pytest.mark.parametrize("pa_type", tm.TIMEDELTA_PYARROW_DTYPES)
 def test_duration_fillna_numpy(pa_type):
     # GH 54707
-Original file line number
+Diff line change
@@ Expand Up / @@ -318,6 +318,7 @@ Timezones @@
     Numeric
     ^^^^^^^
     - Bug in :func:`read_csv` with ``engine="pyarrow"`` causing rounding errors for large integers (:issue:`52505`)
+    - Bug in :meth:`Series.pow` not filling missing values correctly (:issue:`55512`)
     -
     Conversion
@@ Expand Down @@