if shell 条件语句简写_闲话Python之条件语句IF

Myth丶恋晨 2023-01-05 05:18 200阅读 0赞

![766f501ced152bedb6b07d344504c9f9.png][]

我发现好像哪里都会有if，下面就来聊聊Python当中if的常见用法。

最简单的格式就是，只有一个if，比如下面这个：

my_deposit=100000
    his_deposit=200000
    
    if my_deposit<150000 and his_deposit>150000:
       my_deposit+=50000
       his_deposit-=50000
    
    print('now I got',my_deposit,'in my account and he got',his_deposit,'in his account')
    
    
    ###运行结果就会是：
    "now I got 150000 in my account and he got 150000 in his account"

代码中的

my\_deposit+=50000等效于my\_deposit=my\_deposit+50000

his\_deposit-=50000则等效于his\_deposit=his\_deposit-50000

所以最后的结果就是

"now I got 150000 in my account and he got 150000 in his account"

当然啦if不可能只能弄一个是不，一个条件控制语句中if理论上来讲可以有无数个滴，所以当有多个条件语句的时候我们一般会让if搭配elif来使用，比如下面这段代码：

my_name='Sun'
    
    if my_name=='Bao':
        print('YES U R Bao')
    elif my_name=='Chen':
        print('NO U R not Chen')
    elif my_name=='Zhang':
        print('NO U R not Zhang either')
    else:
        print('Come on,who the hell are you!')
    
    ###运行结果是：
    "Come on,who the hell are you!"

因为头一行代码已经设置了全局变量my\_name为Sun，然后接下来的if条件语句中没有针对当my\_name==Sun的return，那么就只能从else后面找了，所以系统会返回"Come on,who the hell are you!"，另外这是一个比较科学的身材判定法，好好审视下自己，如果结果低于100了，还好意思吃这么多吗？

我们也可以将条件语句稍微丰富一下，比如加入一点算数运算之类的，请看下面这段代码：

weight=62
    height=171
    
    if height-weight==110:
        print('Wow,you are in perfect shape!')
    elif 105<=height-weight<=115 and height-weight!=110:
        print('Your body is in good condition')
    else:
        print('please pay more attention to your body')
    
    ###运行结果是：
    "Your body is in good condition"

好好瞅瞅返回啥是根据height-weight即171-162的结果来判定的，结果是109，所以就落在了"elif 105<=height-weight<=115 and height-weight!=110:"这里，所以返回的结果就是"Your body is in good condition"

还有谁说条件只能是单个的，让我们看看下面这个例子：

tall=False
    rich=False
    handsome=True
    
    if tall and rich and handsome:
        print('we match each other perfectly!')
    elif tall and rich:
        print('we might could make a good couple')
    elif rich:
        print('uhhh,I would say yes if you split half of your fortune to me')
    else:
        print('fuck off you bastard diors!')
    
    ###运行结果是：
    "fuck off you bastard diors!"

布尔值True/False就是给if条件判断语句里的关键词赋值滴，另外代码为什么要编写的如此现实残酷，看来光帅还是不够的，这大概就是我到现在还没找到女朋友的原因吧，心塞~

[766f501ced152bedb6b07d344504c9f9.png]: /images/20221119/fd0d2a42a0a046a79435ef2e78227cab.png