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in urllib2, you will find these lines:
 # Wrap the HTTPResponse object in socket's file object adapter
 # for Windows. That adapter calls recv(), so delegate recv()
 # to read(). This weird wrapping allows the returned object to
 # have readline() and readlines() methods.
 # XXX It might be better to extract the read buffering code
 # out of socket._fileobject() and into a base class.
 r.recv = r.read
 fp = socket._fileobject(r, close=True)
This, storing a bound method in the instance, will cause a reference 
cycle that the user knows nothing about.
I propose creating a wrapper instance with a recv() method instead. Or, 
is there a standard way of storing bound methods on instances? A 
'weakmethod', perhaps?