def decorator_factory(type_):
    def decorator(cls):
        cls.contaVarClasse = sum(
            isinstance(value, type_)
            for name, value in vars(cls).items()
            if not (name.startswith('__') and name.endswith('__'))
        )
        return cls
    return decorator
 
@decorator_factory(str)
class MyClass:
    countme = "b"
    notme = 2
 
    def __init__(self):
        self.dontcountme = "a"
        self.norme = 5
 
print(MyClass.contaVarClasse)
 

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