96     def iterkeys(self):  member in Mailbox
102         return list(self.iterkeys())
106         for key in self.iterkeys():
122         for key in self.iterkeys():
146         for key in self.iterkeys():
160         for key in self.iterkeys():
381     def iterkeys(self):  member in Maildir
554             self._onetime_keys = self.iterkeys()
612     def iterkeys(self):  member in _singlefileMailbox
1065     def iterkeys(self):  member in MH
1076         return len(list(self.iterkeys()))
1193         for key in self.iterkeys():