CLN: remove unnecessary getattr and ensure arg is not mutated

Author: AlexKirko

pandas/core/tools/datetimes.py

@@ -324,7 +324,7 @@ def _convert_listlike_datetimes(
         if isinstance(arg, IntegerArray):
             # Explicitly pass NaT mask to array_with_unit_to_datetime
             mask = arg.isna()
-            arg = getattr(arg, "_ndarray_values", arg)
+            arg = arg._ndarray_values
         else:
             mask = None
 

pandas/tests/indexes/datetimes/test_tools.py

@@ -2297,7 +2297,8 @@ def test_intarray_to_datetime():
     # Test for #30050
     ser = pd.Series([1, 2, None, 2 ** 61, None])
     ser = ser.astype("Int64")
-
+    ser_copy = ser.copy()
+    
     res = pd.to_datetime(ser, unit="ns")
 
     expected = pd.Series(
@@ -2310,3 +2311,5 @@ def test_intarray_to_datetime():
         ]
     )
     tm.assert_series_equal(res, expected)
+    # Check that ser isn't mutated
+    tm.assert_series_equal(ser, ser_copy)