@classmethod while python programming..

[Humble]

As you know, its possible to define a method with decorator called “classmethod”..

>>>> @classmethod
... def first():
...     print "I am first"
... 

>>>



How-ever what advantage it brings ?

That said, A class method is a bound method except that the class of the instance is passed as an argument rather than the instance itself.

>>> class Sports(object):
...     @classmethod
...     def fun(cls, x):
...             print ("%s %s") %(cls,x)
... 
>>> foot = Sports()
>>> foot
<__main__.Sports object at 0x7fa5c9872a50>
>>> foot.fun
<bound method type.fun of <class '__main__.Sports'>>


Look at above, its a bound method of "CLASS" ..

>>> foot.fun("ball")
First arg:<class '__main__.Sports'> => Second arg: ball



Secondly, to call a method inside a class, the class has to be instantiated .., but with classmethod decorator its possible to invoke the class methods without its instance getting created as shown below

>>> Sports.fun("cricket")
First arg:<class '__main__.Sports'> => Second arg: cricket






`
>>> Classfs = type("Classfs",(object,),{"any":first})
>>> Classfs.any()
I am first

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