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.

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