typo, comments, improve test exception handling

Author: ArtificialQualia

doc/source/whatsnew/v0.25.0.rst

@@ -136,7 +136,7 @@ Categorical
 Datetimelike
 ^^^^^^^^^^^^
 
-- Bug with :class:`Timestamp` and :class:`CustomBusinessDay` arithmatic throwing an exception with datetime subclasses (:issue:`25734`)
+- Bug with :class:`Timestamp` and :class:`CustomBusinessDay` arithmetic throwing an exception with datetime subclasses (:issue:`25734`)
 -
 -
 

pandas/_libs/tslibs/conversion.pyx

@@ -384,6 +384,7 @@ cdef _TSObject convert_datetime_to_tsobject(datetime ts, object tz,
             obj.value += ts.nanosecond
             obj.dts.ps = ts.nanosecond * 1000
         except AttributeError:
+            # probably a subclass of datetime
             pass
 
     if nanos:
@@ -613,6 +614,7 @@ cpdef inline datetime localize_pydatetime(datetime dt, object tz):
         try:
             return dt.tz_localize(tz)
         except AttributeError:
+            # probably a subclass of datetime
             pass
     elif is_utc(tz):
         return _localize_pydatetime(dt, tz)

pandas/tests/arithmetic/test_datetime64.py

@@ -2369,8 +2369,11 @@ class FakeDatetime(MetaDatetime("NewBase", (datetime,), {})):
     with monkeypatch.context() as m:
         # monkeypatch datetime everywhere
         for mod_name, module in list(sys.modules.items()):
-            if (mod_name == __name__ or
-               module.__name__ in ('datetime',)):
+            try:
+                if (mod_name == __name__ or
+                module.__name__ in ('datetime',)):
+                    continue
+            except AttributeError:
                 continue
             for attribute_name in dir(module):
                 try: