gistfile1.py

  def flush(self):
    wout = self.__wbuf.getvalue()
    wsz = len(wout)
    # reset wbuf before write/flush to preserve state on underlying failure
    self.__wbuf = StringIO()
    # N.B.: Doing this string concatenation is WAY cheaper than making
    # two separate calls to the underlying socket object. Socket writes in
    # Python turn out to be REALLY expensive, but it seems to do a pretty
    # good job of managing string buffer operations without excessive copies
    buf = pack("!i", wsz) + wout
    self.__trans.write(buf)
    self.__trans.flush()