dict.has_key(a) --> a in dict

has_key() is gone in python3, so use a more modern syntax here.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>

offlineimap/imaplibutil.py

@@ -137,7 +137,7 @@ class WrappedIMAP4_SSL(UsefulIMAPMixIn, IMAP4_SSL):
     """Improved version of imaplib.IMAP4_SSL overriding select()"""
     def __init__(self, *args, **kwargs):
         self._fingerprint = kwargs.get('fingerprint', None)
-        if kwargs.has_key('fingerprint'):
+        if 'fingerprint' in kwargs:
             del kwargs['fingerprint']
         super(WrappedIMAP4_SSL, self).__init__(*args, **kwargs)