假设我现在使用print大法打印了一段日志：
我想把这段日志注释掉，大家会怎么做呢？相信大多数人都是在行首加上一个#号：
有些人可能也会用多行注释：
但有些人，偏偏喜欢另辟蹊径标新立异，非要跟大家不一样，他们是这样写的：
在print和左括号之间，加了一个冒号。从效果上看，确实也起到了注释的作用：
[image:029695FF-7538-4215-8977-31A43EE9B51C-383-0000504BC19305F0/047B50A4-F251-42F3-B1D2-16EA50CD86E3.png]
为什么这样写也能实现注释的效果呢？这就要从 Python 的类型标注说起。
Python作为一个动态语言，其本身对变量类型是没有强制要求的，同一个变量，我们既可以让它是int，也可以让它是字符串：
但项目规模大起来以后，这种特性可能会带来很多难以察觉的隐患。因此，Python引入了一个新的功能，叫做类型标注。在定义变量、函数接收参数的时候，我们可以指定它们的类型，如果赋值或者传递参数的时候类型不匹配，IDE会给你加上深色背景，提醒你这里有问题，如下图所示：
但类型标注这个功能是给IDE或者静态检查工具使用的，Python解释器在解释代码的时候，会自动忽略它。所以即使你强行不遵守也没有关系，如下图所示：
.
有些人正是看中了Python解释器自动忽略类型标注这个特点，动起了歪脑筋，干起了奇技淫巧的勾当。
因为类型标注中，冒号后面的类型，除了我们常见的类型外，还可以是我们自定义的类，甚至是一个列表：
同时，类型标注也可以不赋值，所以这样写也是可以的：
这样一来，显然下面这种写法也是可以的：
现在，我们把列表改成元组，于是就变成了：
现在我们把kingname_god改成print，于是我们就得到了：
因为元组也可以只有一个元素，所以显然：
这种写法也是合法的，它表示把 print变量标注为('我是日志')类型，但不赋值。
由于Python 解释器会自动忽略类型标注，所以对于这种没有赋值的类型，Python 会自动忽略整行，所以看起来就像是被注释了一样。
为了更好地证明print:('我是日志')本质上是一个没有赋值的类型标注，我们来看一下字节码：
可以看到，这两种写法，我们一行一行对比，他们的字节码流程完全一样，差别仅仅在用的类型是int还是'我是日志'，以及变量名是a还是print。
除了print外，任何我们自定义的函数甚至是字典、列表都可以这样写，例如：
但我真切希望，任何一个脑袋正常的同学都不要这样写。这种写法除了炫技以外没有任何作用。
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data-darkmode-color-15900529136199="rgb(230, 230, 230)" data-darkmode-original-color-15900529136199="rgb(0, 0, 0)" data-darkmode-bgimage-15900529136199="1" style="margin-left: 2px;width: 20px;"></section><section data-brushtype="text" data-darkmode-bgcolor-15860613985508="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15860613985508="rgb(255, 255, 255)" data-darkmode-color-15860613985508="rgb(51, 51, 51)" data-darkmode-original-color-15860613985508="rgb(51, 51, 51)" data-darkmode-bgimage-15860613985508="1" data-darkmode-bgcolor-15870356070738="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356070738="rgb(255, 255, 255)" data-darkmode-color-15870356070738="rgb(51, 51, 51)" data-darkmode-original-color-15870356070738="rgb(51, 51, 51)" data-darkmode-bgimage-15870356070738="1" data-darkmode-bgcolor-15870356071023="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356071023="rgb(255, 255, 255)" data-darkmode-color-15870356071023="rgb(51, 51, 51)" data-darkmode-original-color-15870356071023="rgb(51, 51, 51)" data-darkmode-bgimage-15870356071023="1" data-darkmode-bgcolor-15882384789136="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882384789136="rgb(255, 255, 255)" data-darkmode-color-15882384789136="rgb(51, 51, 51)" data-darkmode-original-color-15882384789136="rgb(51, 51, 51)" data-darkmode-bgimage-15882384789136="1" data-darkmode-bgcolor-15882396318564="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882396318564="rgb(255, 255, 255)" data-darkmode-color-15882396318564="rgb(51, 51, 51)" data-darkmode-original-color-15882396318564="rgb(51, 51, 51)" data-darkmode-bgimage-15882396318564="1" data-darkmode-bgcolor-15900529136199="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15900529136199="rgb(255, 255, 255)" data-darkmode-color-15900529136199="rgb(51, 51, 51)" data-darkmode-original-color-15900529136199="rgb(51, 51, 51)" data-darkmode-bgimage-15900529136199="1" style="font-size: 14px;color: rgb(51, 51, 51);text-align: left;"><span style="font-family: 楷体, 楷体_GB2312, SimKai;font-size: 15px;">点这里，进菜鸟学PythonB站大本营</span></section></section></section></section></section></section></section>本篇文章来源于: 菜鸟学Python
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