generic_class_method.py

import sys
from types import MethodType

class genericclassmethod:
    def __init__(self, f):
        self.f = f

    def __get__(self, instance, owner=None):
        caller = sys._getframe().f_back
        if caller.f_code.co_qualname == '_BaseGenericAlias.__getattr__':
            ga = caller.f_locals["self"]
            return MethodType(self.f, ga)
        raise TypeError(f"Call to {self.f.__name__} with no parameter specified")

class MyClass[T]:
    @genericclassmethod
    def print_type_param(cls):
        print(f"T = {cls.__args__[0]}")

MyClass[int].print_type_param()