Python自动化--5. if判断语句

5. if判断语句

In [1]: n =input("请输入一个数字：")
请输入一个数字：18

In [2]: n = int(n)

In [3]: type(n)
Out[3]: int

In [4]: if n == 18:
   ...:     print("猜对了！")   #缩进四个空格为标准写法
   ...:     print("相等")
   ...: 
猜对了！
相等

In [5]: n = 19

In [6]: if n == 19:
   ...:     print("相等")
   ...: else:
   ...:     print("不相等")
   ...: 
相等

In [7]: if n == 18:
   ...:     print("相等")
   ...: else:
   ...:     print("不相等")
   ...: 
不相等

In [13]: n = 19

In [14]: if n == 18:
    ...:     print("相等")
    ...: elif n > 18:
    ...:     print("大了")
    ...: elif n < 18:
    ...:     print("小了")
    ...: 
大了

In [15]: n = 17

In [16]: if n == 18:
    ...:     print("相等")
    ...: elif n > 18:
    ...:     print("大了")
    ...: elif n < 18:
    ...:     print("小了")
    ...: 
小了

else

In [19]: if 19 == 18:
    ...:     print("相等")
    ...: elif 17 > 18:
    ...:     print("大了")
    ...: elif 19 < 18:
    ...:     print("小了")
    ...: else:
    ...:     print("以上条件都没满足")
    ...: 
以上条件都没满足

In [25]: n = ''

In [26]: if n:
    ...:     print("ok")
    ...: else:
    ...:     print("no")
    ...: 
no

# '' False [] ()  {}  None  为假的

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