Giampaolo Rodola' <g.rod...@gmail.com> added the comment:

Follow my comments:

> +                 source_address=('', 0)):

Make that default to None instead and pass it as-is to 
socket.create_connection().

> +        self.source_address = source_address

There's no need to store the source address as an instance attribute. 
Just pass it as-is to socket.create_connection() in __init__ and connect 
methods and then get rid of it.


I think source_address no longer makes sense in UNIX sockets / LMTP class. 
Or at least, this is what I get if I try to bind() a UNIX socket:

>>> import socket
>>> sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
>>> sock.bind(("", 0))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<string>", line 1, in bind
TypeError: argument must be string or read-only character buffer, not tuple
>>>

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<http://bugs.python.org/issue11281>
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