python 跳出多层循环的办法，使用flag，

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one = ['a','b','c','d']
two = [1,2,3,4]

flag = False

for i in one:
    if flag == True:
        break
    print i

    if i == 'b':
        for m in two:
            print m
            if m == 3:
                flag = True
                break