SyntaxError: invalid syntax in arango/async.py

[appscluster]

File "/usr/local/lib/python2.7/dist-packages/arango/async.py", line 12
return CommandsProxy(obj
^
SyntaxError: invalid syntax

Contents of async.py
class CommandsProxy(object):
def init(self, obj):
self._obj = obj

def __getattr__(self):
    pass

def factory(obj):
return CommandsProxy(obj