you'd save more in [not_very_convenient_name for not_very_convenient_name in y if z]
(just kidding) -- http://mail.python.org/mailman/listinfo/python-list
you'd save more in [not_very_convenient_name for not_very_convenient_name in y if z]
(just kidding) -- http://mail.python.org/mailman/listinfo/python-list