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title: Python
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date: 2020-11-13 20:40:15
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updated: 2021-02-08 12:29:56
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---
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### 一、python类的实例方法、静态方法和类方法区别及其应用场景
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[https://blog.csdn.net/helloxiaozhe/article/details/79940321](https://blog.csdn.net/helloxiaozhe/article/details/79940321)
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### 二、python 中cls和self的区别
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self:指的是一个具体实例的本身。如果在class中的某个方法加了@classmethod修饰器,那么这个方法不需要实例化也能直接被其他程序调用。
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cls:表示这个类本身。
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[https://blog.csdn.net/gtf215998315/article/details/106868558](https://blog.csdn.net/gtf215998315/article/details/106868558)
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### 三、list.extend()和list.append()
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>>> li = ['a', 'b', 'c']
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>>> li.extend(['d', 'e', 'f'])
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>>> li ['a', 'b', 'c', 'd', 'e', 'f']
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>>> len(li)
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6
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>>> li[-1] 'f' >>> li = ['a', 'b', 'c']
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>>> li.append(['d', 'e', 'f'])
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>>> li ['a', 'b', 'c', ['d', 'e', 'f']]
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>>> len(li)
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4
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>>> li[-1] ['d', 'e', 'f']
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