python-selfteacing 02

学习内容：

if条件判断和嵌套

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思维导图：

https://mubu.com/doc/3FrkC6Cyew

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代码仓库：

https://github.com/aosjiabei/AOS-Python-Selfteaching-Camp/tree/master/02_%E6%9D%A1%E4%BB%B6%E5%88%A4%E6%96%AD

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意外惊喜

多个if语句和 if…elif…的区别

• 多个if语句，程序运行时会遍历所有if；
• if-elif，只要if或后续某一个elif之一满足逻辑值为True，则程序执行完对应输出语句后自动结束该轮if-elif（即不会再去执行后续的elif或else)

if a>10:
    print('a nice')
if a>11:
    print('a very nice')
if a>=12:
    print('a very very nice')

b=12
if b>10:
    print('b nice')
elif b>11:
    print('b very nice')
elif b>=12:
    print('b very very nice')

输出结果：
a nice
a very nice
a very very nice
b nice

a=12
if a>12:
    print('a nice')
if a>11:
    print('a very nice')
if a>=12:
    print('a very very nice')

b=12
if b>12:
    print('b nice')
elif b>11:
    print('b very nice')
else:
    print('b very very nice')

a very nice
a very very nice
b very nice

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