可能有这样一种情况,当你想检查其他条件后一个条件解析为真。在这种情况下,可以使用嵌套的if结构。
在嵌套的 if 语句结构,可以在一个 if... elif... else 结构里面可有另外一个 if...
elif... else 结构。
语法:
嵌套 if...elif...else 结构的语法可以是:
if expression1: statement(s) if expression2: statement(s) elif expression3: statement(s) else statement(s) elif expression4: statement(s) else: statement(s) |
例如:
#!/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!" |
当执行上面的代码,它会产生以下结果:
Expression value is less than 200 Which is 100 Good bye! |
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