97     def iterkeys(self):  member in Mailbox
103         return list(self.iterkeys())
107         for key in self.iterkeys():
123         for key in self.iterkeys():
158         for key in self.iterkeys():
395     def iterkeys(self):  member in Maildir
564             self._onetime_keys = self.iterkeys()
622     def iterkeys(self):  member in _singlefileMailbox
1076     def iterkeys(self):  member in MH
1087         return len(list(self.iterkeys()))
1201         for key in self.iterkeys():