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# classmethod example
In [20]: class MyClass:
@classmethod :
def set_att(cls, value): :
cls.att = value :
:
In [21]: MyClass.set_att(1)
In [22]: MyClass.att
Out[22]: 1
In [23]: obj = MyClass()
In [24]: obj.att
Out[24]: 1
In [25]: obj.set_att(3)
In [26]: obj.att
Out[26]: 3
In [27]: MyClass.att
Out[27]: 3