python双层for循环详解_python 双层for循环?

a = [0, 1, 2]
for i in range(len(a)):
    b = 1
    for j in range(2):
        c = a[j]
        if c > 2:   # 修改这个值决定是否break
            break
    else:
        for k in range(2):
            if a[k] > 0:
                break
        else:
            d = 2
            print('d=', d)
e = 2
print(e)

模仿一下debug看看