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Python > Learn Python > What is the 'cls' variable used for in Python classes?
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What is the 'cls' variable used for in Python classes?

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cls in Python holds the reference of the class. It is passed as the first argument to every class methods (methods with @classmethod decorator) by Python itself. class MyClass: @classmethod def what_is_cls(cls): print(cls) MyClass().what_is_cls() #outputs <class '__main__.MyClass'>It is important...
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cls in Python holds the reference of the class. It is passed as the first argument to every class methods (methods with @classmethod decorator) by Python itself.

class MyClass:
@classmethod
def what_is_cls(cls):
print(cls)

MyClass().what_is_cls() #outputs <class '__main__.MyClass'>
It is important to note that self and cls are not reserved keywords. They are just naming conventions in Python.

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IT professional but interested in teaching english and hindi

cls accepts the class Person as a parameter rather than Person's object/instance. Now, we pass the method Person. printAge as an argument to the function classmethod . This converts the method to a class method so that it accepts the first parameter as a class (i.e. Person).
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