Simplify tm_gmtoff lookup

Author: yuanx749

Lib/imaplib.py

@@ -1869,10 +1869,7 @@ def Time2Internaldate(date_time):
         dt = datetime.fromtimestamp(date_time,
                                     timezone.utc).astimezone()
     elif isinstance(date_time, tuple):
-        try:
-            gmtoff = date_time.tm_gmtoff
-        except AttributeError:
-            gmtoff = None
+        gmtoff = getattr(date_time, "tm_gmtoff", None)
         if gmtoff is None:
             if time.daylight:
                 dst = date_time[8]