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Adding __exit__ will not make asyncore.file_wrapper close file descriptor when garbage collected.
Here is clone of socket.py solution for the same problem.
 def close(self):
 if self.fd:
 os.close(self.fd)
 self.fd = None # or maybe self.fd = 0 will be better
 def __del__(self):
 try:
 self.close()
 except:
 # close() may fail if __init__ didn't complete
 pass