if…if…if…搭配成的语句块,会一个个去匹配是否满足if里面的语句;
if与elif的搭配成的语句块,当匹配到if或者elif语句判断为True的时候,那么不会执行下面elif以及else里面的语句;
示例1:

a = 10
if a > 1:
    print(1)
else:
    print(0)

运行结果:
1


示例2:

a = 10
if a > 1:
    print(1)
if a > 2:
    print(2)
if a < 3:
    print(3)
else:
    print(0)

运行结果:
1
2
0


示例3:

a = 10
if a > 1:
    print(1)
elif a > 2:
    print(2)
elif a < 3:
    print(3)
else:
    print(0)

运行结果:
1


示例4:

a = 10
if a > 1:
    print(1)
elif a > 2:
    print(2)
elif a < 3:
    print(3)
if a > 4:
    print(4)
elif a > 5:
    print(5)
else:
    print(0)

运行结果:
1
4

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