Python 嵌套的IF语句

Python 嵌套 IF 语句

Python 条件语句

可能会出现在条件解析为真后您想检查另一个条件的情况。在这种情况下，您可以使用嵌套的if 结构。在嵌套if结构中，你可以有一个，IF... ELIF ...ELSE 构造里面写另一个 IF... ELIF...ELSE 结构。

语法

嵌套的if...elif...else构造的语法可能是 -

if expression1:
   statement(s)
   if expression2:
      statement(s)
   elif expression3:
      statement(s)
   elif expression4:
      statement(s)
   else:
      statement(s)
else:
   statement(s)

示例

#!/usr/bin/python

var = 100
if var < 200:
   print "Expression value is less than 200"
   if var == 150:
      print "Which is 150"
   elif var == 100:
      print "Which is 100"
   elif var == 50:
      print "Which is 50"
   elif var < 50:
      print "Expression value is less than 50"
else:
   print "Could not find true expression"

print "Good bye!"

运行示例

执行上述代码时，结果如下：

Expression value is less than 200
Which is 100
Good bye!

Python 条件语句