Christian Heimes added the comment:

Here is another example of how broken and dangerous fileno argument is. 
getpeername() is neither a valid IPv4 tuple nor a valid IPv6 tuple. It's all 
messed up:

>>> import socket
>>> s = socket.create_connection(('www.python.org', 443))
>>> s
<socket.socket fd=3, family=AddressFamily.AF_INET6, 
type=SocketKind.SOCK_STREAM, proto=6, 
laddr=('2003:58:bc4a:3b00:56ee:75ff:fe47:ca7b', 59730, 0, 0), 
raddr=('2a04:4e42:1b::223', 443, 0, 0)>
>>> socket.socket(fileno=s.fileno())
<socket.socket fd=3, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, 
proto=0, laddr=('2003:58:bc4a:3b00::%2550471192', 59730, 0, 2550471192), 
raddr=('2a04:4e42:1b:0:700c:e70b:ff7f:0%2550471192', 443, 0, 2550471192)>

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28134>
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