decode_rfc2231(): As Christian Robottom Reis points out, it makes no sense to

test for parts > 3 when we use .split(..., 2).

Lib/email/utils.py

@@ -235,10 +235,6 @@ def decode_rfc2231(s):
     parts = s.split(TICK, 2)
     if len(parts) <= 2:
         return None, None, s
-    if len(parts) > 3:
-        charset, language = parts[:2]
-        s = TICK.join(parts[2:])
-        return charset, language, s
     return parts