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		     dict的循环:     >>> knights = {'gallahad': 'the pure', 'robin': 'the brave'}     >>> for k, v in knights.items():     ...     print k, v     ...     gallahad the purerobin the brave     list的循环:     >>> for i, v in enumerate(['tic', 'tac', 'toe']):     ...     print i, v     ...     0 tic     1 tac     多个list的循环:     >>> questions = ['name', 'quest', 'favorite color']     >>> answers = ['lancelot', 'the holy grail', 'blue']     >>> for q, a in zip(questions, answers):     ...     print 'What is your %s? It is %s.' % (q, a)     ...     What is your name? It is lancelot.     What is your quest? It is the holy grail. |