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In httplib.py, line 336, the following code appears: 
 def _set_hostport(self, host, port):
 if port is None:
 i = string.find(host, ':')
 if i >= 0:
 port = int(host[i+1:])
 host = host[:i]
 else:
 port = self.default_port
 self.host = host
 self.port = port
Ths code breaks if the host string ends with ":", so that
int("") is called. In the old (1.5.2) version of this 
module, the corresponding int () conversion used to be 
enclosed in a try/except pair: 
 try: port = string.atoi(port)
 except string.atoi_error:
 raise socket.error, "nonnumeric port"
and this fixed the problem. 
Note BTW that now the error reported by int is 
"ValueError: invalid literal for int():"
rather than the above string.atoi_error. 
I found this problem while downloading web pages, 
but unfortunately I cannot pinpoint which page 
caused the problem. 
Luca de Alfaro