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                1、while() ``` age = raw_input("please give me your age in years (eg.30):") while not age.isdigit(): print "I'm sorry,but {} isn't valid.".format(age) age = raw_input("please give me your age in years (eg.30):") print "thanks! your age is set to {} ".format(age) ``` 2、無限循環![] ``` while True: text = raw_input("give me some text,and I'll count the e's.Enter 'q' to quit: ") if text == 'q': break print text.count('e') ```
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