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use 'x is None' instead of 'x == None'...

use 'x is None' instead of 'x == None' The built-in None object is a singleton and it is therefore safe to compare memory addresses with is. It is also faster, how much depends on the object being compared. For a simple type like str I get: | s = "foo" | s = None ----------+-----------+---------- s == None | 0.25 usec | 0.21 usec s is None | 0.17 usec | 0.17 usec

Nicolas Dumazet - - Load All Authors

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      # server.py - inotify common protocol code

      #

      # Copyright 2006, 2007, 2008 Bryan O'Sullivan <bos@serpentine.com>

      # Copyright 2007, 2008 Brendan Cully <brendan@kublai.com>

      #

      # This software may be used and distributed according to the terms of the

      # GNU General Public License version 2, incorporated herein by reference.

      import cStringIO, socket, struct

      version = 1

      resphdrfmts = {

          'STAT': '>llllllll' # status requests

      }

      resphdrsizes = dict((k, struct.calcsize(v))

                          for k, v in resphdrfmts.iteritems())

      def recvcs(sock):

          cs = cStringIO.StringIO()

          s = True

          try:

              while s:

                  s = sock.recv(65536)

                  cs.write(s)

          finally:

              sock.shutdown(socket.SHUT_RD)

          cs.seek(0)

          return cs

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				# server.py - inotify common protocol code
				#
				# Copyright 2006, 2007, 2008 Bryan O'Sullivan <bos@serpentine.com>
				# Copyright 2007, 2008 Brendan Cully <brendan@kublai.com>
				#
				# This software may be used and distributed according to the terms of the
				# GNU General Public License version 2, incorporated herein by reference.

				import cStringIO, socket, struct

				version = 1

				resphdrfmts = {
				'STAT': '>llllllll' # status requests
				}
				resphdrsizes = dict((k, struct.calcsize(v))
				for k, v in resphdrfmts.iteritems())

				def recvcs(sock):
				cs = cStringIO.StringIO()
				s = True
				try:
				while s:
				s = sock.recv(65536)
				cs.write(s)
				finally:
				sock.shutdown(socket.SHUT_RD)
				cs.seek(0)
				return cs