class

constructor

__init__() is called constructor

we need a constructor to refer to the parameter in a class

syntax example

class My_class:

  def __init__(self, my_parameter):

    self.input = my_parameter

  def print_me(self):

    print(self.input)

instance = My_class("my_input") 

instance.print_me()

child class

class My_super_class:

class My_sub_class(My_super_class):