Both pickle and cPickle seem to have problem pickling boost wrapped enum types. Pickle protocol used here is 2. Problem is causes by enum.cpp. In there __name__ and __module__ are intentionally set in certain way (which is different than how its done in class.cpp). So I suppose there is a valid reason why its that way. In that case the __reduce__ and __reduce_ex__ implementation for enum_ should take care of this so as to ensure proper pickling. Example: import EnumTest import cPickle try: print "Lets pickle some boost enum:" f = open("tmp1.txt", "w") cPickle.dump( EnumTest.Color.red , f, cPickle.HIGHEST_PROTOCOL) except: print "FAIL\n" try: print "Why is EnumTest.Color.__name__ = '%s' and \nEnumTest.Color.__module__= '%s' ?\n" % ( EnumTest.Color.__name__, EnumTest.Color.__module__) print "Lets hack it and try again:" f = open("tmp2.txt", "w") EnumTest.Color.__name__ = "Color" EnumTest.Color.__module__ = "EnumTest" l = (EnumTest.Color.red, EnumTest.Color.green, EnumTest.Color.blue) for e in l: cPickle.dump( e , f, cPickle.HIGHEST_PROTOCOL) f.close() print "PASS\n" print "Unpickle Test:" f = open("tmp2.txt", "r") for e in l: if e != cPickle.load(f): raise "Load Failed" print "PASS\n" except: print "FAIL\n" Thanks -Shashank _________________________________________________________________ View Athlete’s Collections with Live Search http://sportmaps.live.com/index.html?source=hmemailtaglinenov06&FORM=MGAC01