Classes

This code snippet comes from Heath Adams at TCM Security, and is the best snippet i have been able to find to understand Python classes. I have also added comments to help you understand the flow.

#Defining your class
class Shoes:

        #Initiates the class and assigns the `name` and `price` values
        def __init__(self, name, price):
                self.name = name
                self.price = float(price)
        
        #Checks the input of the user to make sure that the input is an integer or a float
        def budget_check(self, budget):
                if not isinstance(budget, (int, float)):
                        print('Invalid entry. Please enter a number.')
                        exit()

        #Calculates the change from your budget based on the inputted price
        def change(self, budget):
                return (budget - self.price)
        
        #Calculates whether or not you'll be able to afford the shoes and uses the above class functions to compile the data
        def buy(self, budget):
                self.budget_check(budget)
        
                if budget >= self.price:
                        print(f'You can cop some {self.name}')
                        
                        if budget == self.price:
                                print('You have exactly enough money for these shoes.')
                        else:
                                print(f'You can buy these shoes and have ${self.change(budget)} left over')

                        exit('Thanks for using our shoe budget app!')

#!/bin/python3

from Shoes import Shoes

low = Shoes('And 1s', 30)
medium = Shoes('Air Force 1s', 120)
high = Shoes('Off Whites', 400)
 
try:
   shoe_budget = float(input('What is your shoe budget? '))
except ValueError:
   exit('Please enter a number')
  
for shoes in [high, medium, low]:
   shoes.buy(shoe_budget)