How to get Parent Class name in Python

I am writing a huge code, wherein we need to use concepts of core object-oriented paradigms, much of our code is developed using the class structure. a snippet of it is as demonstrated herewith.

class base_class(object):
    def get_class_name(self):
        return self.__class__name

class derived_class(base_class):
    def __init__(self):

object = derived_class()

for some critical operation i need to get the name of the base class from the object variable, which is the object of the derived class, but not sure how to do that in python, any reference shall be highly appreciable.