understanding oop python code example

Example 1: oop in python

class Object:
    #__init__() is called when you create an Object class
    def __init__(self,arg):
        #stores argument in self
        self.arg = arg
        
    def printArg(self):
        #calls argument from self
        print(self.arg)

Example 2: real python oop

>>> class Dog:
...     pass
...
>>> a = Dog()
>>> type(a)
<class '__main__.Dog'>