What is the purpose of static methods? How do I know when to use one? [duplicate]

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See this article for detailed explanation.

TL;DR

1.It eliminates the use of self argument.

2.It reduces memory usage because Python doesn’t have to instantiate a bound-method for each object instiantiated: 

>>>RandomClass().regular_method is RandomClass().regular_method
False
>>>RandomClass().static_method is RandomClass().static_method
True
>>>RandomClass.static_method is RandomClass().static_method
True

3.It improves code readability, signifying that the method does not depend on state of the object itself.

4.It allows for method overriding in that if the method were defined at the module-level (i.e. outside the class) a subclass would not be able to override that method.

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