Merge branch 'main' into main

Author: Wang Haoxiang

pandas/io/sas/sas_xport.py

@@ -17,7 +17,6 @@
 
 import numpy as np
 
-from pandas.util._decorators import Appender
 from pandas.util._exceptions import find_stack_level
 
 import pandas as pd
@@ -126,20 +125,6 @@
     Contains information about the variables in the file
 """
 
-_read_method_doc = """\
-Read observations from SAS Xport file, returning as data frame.
-
-Parameters
-----------
-nrows : int
-    Number of rows to read from data file; if None, read whole
-    file.
-
-Returns
--------
-A DataFrame.
-"""
-
 
 def _parse_date(datestr: str) -> DatetimeNaTType:
     """Given a date in xport format, return Python date."""
@@ -464,8 +449,19 @@ def _missing_double(self, vec):
         miss &= miss1
         return miss
 
-    @Appender(_read_method_doc)
     def read(self, nrows: int | None = None) -> pd.DataFrame:
+        """Read observations from SAS Xport file, returning as data frame.
+
+        Parameters
+        ----------
+        nrows : int
+            Number of rows to read from data file; if None, read whole
+            file.
+
+        Returns
+        -------
+        A DataFrame.
+        """
         if nrows is None:
             nrows = self.nobs
 

pandas/tests/indexing/test_loc.py

@@ -258,6 +258,25 @@ def test_loc_getitem_single_boolean_arg(self, obj, key, exp):
         else:
             assert res == exp
 
+    @pytest.mark.parametrize(
+        "data",
+        [
+            [datetime(2025, 10, 30)],
+            [Timestamp(2025, 10, 30)] * 2,
+            [Timedelta(1)],
+            [Timedelta(1), Timedelta(2)],
+        ],
+    )
+    def test_loc_empty_slice_assignment_with_datetime(self, data):
+        # issue #50942
+        # empty slice assignment with datetime or timedelta should not raise exceptions
+        mask = [False] * len(data)
+
+        df = DataFrame(data=data, columns=["A"])
+        expected = df.copy()
+        df.loc[mask] = df
+        tm.assert_frame_equal(df, expected)
+
 
 class TestLocBaseIndependent:
     # Tests for loc that do not depend on subclassing Base