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BTW, if you're new to socket programming, do read Python's 
socket programming HOWTO:

http://www.amk.ca/python/howto/sockets/

I expect you're the only person in history to try passing such 
a large value to recv() -- even if it worked, you'd almost 
certainly run out of memory trying to allocate buffer space for 
1.9GB.  sockets are a low-level facility, and it's common to 
pass a relatively small power of 2 (for best match with 
hardware and network realities).