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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