test=range(1,21)while(1): number=input("Enter your number:"
) try: if number in test: print 'yes' except: pass 补充:如果你要对一个序列进行映射,可以用map:>>> x=range(1,21)>>> y=map(int,x)>>> y[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
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