Python：同行if...else...详细教程

矫情吗；* 2024-03-30 16:33 49阅读 0赞

我最近为游戏Apple Clicker写成就系统，加上后**整个程序的代码竟然超过2200行，窗口启动时间也很慢**，主要是if...else...使用的太多。于是查了查缩短代码的方法，总结如下：

--------------------

## 示例一 ##

if get > 10 :
    	num = 1
    else:
    	num = 0

可以简化为：

num = 1 if param > 10 else 0

--------------------

## 示例二 ##

if param > 10 :
    	num = 1
    elif param == 10:
    	num = 2
    else:
    	num = 0

可以简化为：

num = 1 if param > 10  else 2 if param == 10 else 0

多行语句可以用**分号“; ”**隔开。

--------------------

## 示例三 ##

这是成就系统的一小部分：

if apple_amount >= 1 and achievement_1_get == 0:
    -            achievement_1_on = 1
    -        else:
    -            achievement_1_on = 0
    -        if apple_amount >= 100 and achievement_2_get == 0:
    -            achievement_2_on = 1
    -        else:
    -            achievement_2_on = 0
    -        if apple_amount >= 1000 and achievement_3_get == 0:
    -            achievement_3_on = 1
    -        else:
    -            achievement_3_on = 0
    -        if apple_amount >= 10000 and achievement_4_get == 0:
    -            achievement_4_on = 1
    -        else:
    -            achievement_4_on = 0
    -        if apple_amount >= 100000 and achievement_5_get == 0:
    -            achievement_5_on = 1
    -        else:
    -            achievement_5_on = 0
    -        if apple_amount >= 1000000 and achievement_6_get == 0:
    -            achievement_6_on = 1
    -        else:
    -            achievement_6_on = 0
    -        if apple_amount >= 10000000 and achievement_7_get == 0:
    -            achievement_7_on = 1
    -        else:
    -            achievement_7_on = 0
    -        if apple_amount >= 100000000 and achievement_8_get == 0:
    -            achievement_8_on = 1
    -        else:
    -            achievement_8_on = 0
    -        if apple_amount >= 1000000000 and achievement_9_get == 0:
    -            achievement_9_on = 1
    -        else:
    -            achievement_9_on = 0
    -        if apple_amount >= 10000000000 and achievement_10_get == 0:
    -            achievement_10_on = 1
    -        else:
    -            achievement_10_on = 0
    -        if apple_amount >= 100000000000 and achievement_31_get == 0:
    -            achievement_31_on = 1
    -        else:
    -            achievement_31_on = 0
    -        if apple_amount >= 1000000000000 and achievement_32_get == 0:
    -            achievement_32_on = 1
    -        else:
    -            achievement_32_on = 0
    -        if apple_amount >= 10000000000000 and achievement_33_get == 0:
    -            achievement_33_on = 1
    -        else:
    -            achievement_33_on = 0
    -        if apple_amount >= 100000000000000 and achievement_34_get == 0:
    -            achievement_34_on = 1
    -        else:
    -            achievement_34_on = 0
    -        if apple_amount >= 1000000000000000 and achievement_35_get == 0:
    -            achievement_35_on = 1
    -        else:
    -            achievement_35_on = 0

修改后变成这样：

achievement_1_on = 1 if apple_amount >= 1 and achievement_1_get == 0 else 0
    achievement_2_on = 1 if apple_amount >= 100 and achievement_2_get == 0 else 0
    achievement_3_on = 1 if apple_amount >= 1000 and achievement_3_get == 0 else 0
    achievement_4_on = 1 if apple_amount >= 10000 and achievement_4_get == 0 else 0
    achievement_5_on = 1 if apple_amount >= 100000 and achievement_5_get == 0 else 0
    achievement_6_on = 1 if apple_amount >= 1000000 and achievement_6_get == 0 else 0
    achievement_7_on = 1 if apple_amount >= 10000000 and achievement_7_get == 0 else 0
    achievement_8_on = 1 if apple_amount >= 100000000 and achievement_8_get == 0 else 0
    achievement_9_on = 1 if apple_amount >= 1000000000 and achievement_9_get == 0 else 0
    achievement_10_on = 1 if apple_amount >= 10000000000 and achievement_10_get == 0 else 0
    achievement_31_on = 1 if apple_amount >= 100000000000 and achievement_31_get == 0 else 0
    achievement_32_on = 1 if apple_amount >= 1000000000000 and achievement_32_get == 0 else 0
    achievement_33_on = 1 if apple_amount >= 10000000000000 and achievement_33_get == 0 else 0
    achievement_34_on = 1 if apple_amount >= 100000000000000 and achievement_34_get == 0 else 0
    achievement_35_on = 1 if apple_amount >= 1000000000000000 and achievement_35_get == 0 else 0

**既简洁、易读又省行数**，初学者可能比较难理解，但用一用就熟悉了。

把所有if...else...修改后，整个程序的长度只剩1600多行了，效果还是很显著的。

![6560459e415340a2aa67ac9020828705.png][]

![9a5b74b15a3049fb8e0f8f36164005f3.png][]

![7fc07d19087d41bf9a064ec09339cc9a.png][]

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[6560459e415340a2aa67ac9020828705.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/13ac60a1e1784c07b425d044c84620ea.png
[9a5b74b15a3049fb8e0f8f36164005f3.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/07ba43bc99bb4bc883118aa4767462ce.png
[7fc07d19087d41bf9a064ec09339cc9a.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/41ce84dc99fa4019b36ee1cd9f14d28d.png