When I use this function, python 3 gave me the following error:

Traceback (most recent call last):
File "./pybot.py", line 108, in <module>
Bot().start()
File "/usr/lib/python3.4/site-packages/irc/bot.py", line 266, in start
super(SingleServerIRCBot, self).start()
File "/usr/lib/python3.4/site-packages/irc/client.py", line 1263, in start
self.manifold.process_forever()
File "/usr/lib/python3.4/site-packages/irc/client.py", line 280, in process_forever
self.process_once(timeout)
File "/usr/lib/python3.4/site-packages/irc/client.py", line 261, in process_once
self.process_data(i)
File "/usr/lib/python3.4/site-packages/irc/client.py", line 218, in process_data
c.process_data()
File "/usr/lib/python3.4/site-packages/irc/client.py", line 578, in process_data
self._process_line(line)
File "/usr/lib/python3.4/site-packages/irc/client.py", line 649, in _process_line
self._handle_event(event)
File "/usr/lib/python3.4/site-packages/irc/client.py", line 672, in _handle_event
self.irclibobj._handle_event(self, event)
File "/usr/lib/python3.4/site-packages/irc/client.py", line 400, in _handle_event
result = handler.callback(connection, event)
File "/usr/lib/python3.4/site-packages/irc/client.py", line 1226, in _dispatcher
method(connection, event)
File "./pybot.py", line 101, in on_pubmsg
self.rootCommands[command].execute(self, server, event)
File "./pybot.py", line 29, in execute
server.part(event.arguments[0].split(" ")[1])
File "/usr/lib/python3.4/site-packages/irc/client.py", line 864, in part
channels = always_iterable(channels)
File "/usr/lib/python3.4/site-packages/irc/jaraco.py", line 13, in always_iterable
if isinstance(item, six.string_types) or not hasattr(item, '__iter__'):
NameError: name 'six' is not defined

So I added 'import six' at the beginning of /usr/lib/python3.4/site-packages/irc/jaraco.py, and it works now.