Why should I use a classmethod in python?

This question already has an answer here:

If you see _randomize method, you are not using any instance variable (declared in init) in it but it is using a class var ie RANDOM_CHOICE = 'abcdefg' .

import random

class Randomize:
    RANDOM_CHOICE = 'abcdefg'

    def __init__(self, chars_num):
        self.chars_num = chars_num

    def _randomize(self, random_chars=3):
        return ''.join(random.choice(self.RANDOM_CHOICE)
                       for _ in range(random_chars))

It means, your method can exist without being an instance method and you can call it directly on class.

  Randomize._randomize()

Now, the question comes does it have any advantages?

ran = Randomize() // Extra steps
ran._randomize()   

You can read more about class and instance variable here.

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