On Wed, 09 Apr 2014 21:09:37 +0800, length power wrote: > words = ["x1", "x2", "x3", "x4", "x5"] > words.append(words.pop(2)) > words.append(words.pop(2)) > words > ['x1', 'x2', 'x5', 'x3', 'x4'] > why i can't write it as: > > [words.append(words.pop(2)) for i in range(0,2)] > >>>> [words.append(words.pop(2)) for i in range(0,2)] > [None, None]
You can, but you don't want to. At this point, even though the comprehension returned something else, words contains what you want. HTH, Dan -- https://mail.python.org/mailman/listinfo/python-list
