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#  #


## 1 ##






![](http://twowaterimage.oss-cn-beijing.aliyuncs.com/2019-10-08-110451.png)

 `@classmethod` 



class method 








![](http://twowaterimage.oss-cn-beijing.aliyuncs.com/2019-10-08-110822.png)

 `cls` ,  `cls` 

 

*  `@classmethod` 
*  `cls` ,  cls  class 
*  `cls.`


 `@classmethod`  `cls` ,




## 2 ##







![](http://twowaterimage.oss-cn-beijing.aliyuncs.com/2019-10-08-113458.png)
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