Simple example class in Python

animal.py

#!/usr/env/bin python

import time

class Animal(object):
    _tired = False
    _pace = 1
    
    def __init__(self, legs, kingdom):
        self.legs = legs
        self.kingdom = kingdom

    def walk(self):
        while not self._tired:
           print('thud')
           time.sleep(self._pace)
           print('thud')
           time.sleep(self._pace)

class Horse(Animal):
    def __init__(self, legs=4, kingdom='Mammalia'):
        super(Horse, self).__init__(legs, kingdom)
        self._pace = self.legs * 0.2