对python内置map和six.moves.map的区别详解

>>> map(lambda a: a*2, [1, 2, 3])[2, 4, 6]>>> m = six.moves.map(lambda a: a*2, [1, 2, 3])>>> type(m)<type 'itertools.imap'>>>> next(m)2>>> next(m)4>>> m.next()6