Why do we use @staticmethod?

Question

I just don’t understand why we need to use @staticmethod. Start with an example.

class test1:
    def __init__(self,value):
        self.value=value

    @staticmethod
    def static_add_one(value):
        return value+1

    @property
    def new_val(self):
        self.value=self.static_add_one(self.value)
        return self.value


a=test1(3)
print(a.new_val) ## >>> 4



class test2:
    def __init__(self,value):
        self.value=value

    def static_add_one(self,value):
        return value+1

    @property
    def new_val(self):
        self.value=self.static_add_one(self.value)
        return self.value


b=test2(3)
print(b.new_val) ## >>> 4

In the above example, a method static_add_onein two classes does not require an instance of the class (self) in the calculation.

The method static_add_onein the class test1is decorated @staticmethodand works correctly.

But at the same time, a method static_add_onein a class test2that has no decoration @staticmethodalso works correctly, using a trick that provides an argument selfin the argument, but does not use it in everything.

So what is the advantage of using @staticmethod? Does performance improve? Or is it simply because of zen python that states that “Explicit is better than implicit”?

Answer 1

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Answer 2

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Answer 3

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class File1:
    def __init__(self, path):
        out=self.parse(path)

    def parse(self, path):
        ..parsing works..
        return x

class File2:
    def __init__(self, path):
        out=self.parse(path)

    @staticmethod
    def parse(path):
        ..parsing works..
        return x

if __name__=='__main__':
    path='abc.txt'
    File1.parse(path) #TypeError: unbound method parse() ....
    File2.parse(path) #Goal!!!!!!!!!!!!!!!!!!!!

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.

Answer 4

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