[Tutor] ecommerce.py

[Christopher Spears]

I am working on problem 13-11 from Core Python Programming (2nd Edition).  For the problem, I am supposed to create the foundations of an e-commerce engine for a B2C business-to-consumer) retailer.  I need to create a class that represents the customer called User, a class for items in inventory called Item, and a shopping cart class called Cart.  I call my Item class Widget because I like the word.  Multiple widgets can go in carts, and a User can have multiple Carts.  Here is what I have written so far:

#!/usr/bin/python

class Widget(object):
    pass

class Cart(object):
    def __init__(self,name):
        self.name = name
	print "Created " + self.name

class User(object):
    def __init__(self,name="John Doe"):
        self.name = name
        print "Hello " + self.name + "!"
	self.cart_number = 0
	self.cart_list = []

    def make_cart(self,cart_name):
        cart = Cart(cart_name)
	self.cart_number = self.cart_number + 1
	self.cart_list.append(cart.name)
	
    def carts_info(self):
        print "You have %d carts!" % self.cart_number
	for i, c in enumerate(self.cart_list):
	    print "%d %s" % (i+1, c) 
        
	
if __name__ == '__main__':
    user_name =  raw_input("Enter your name: ")
    user = User(user_name)
    
    print "You can "
    print "1) Create a cart"
    print "2) Buy a widget"
    print "3) List your carts"
    print "4) Quit"
    
    while True:
        
	while True:
	    choice = raw_input("Pick an option: ")
	    try:
	        choice_int = int(choice)
		break
	    except ValueError:
	        print "Invalid choice!"
	        print "Try again!"
    
        if choice_int == 1: 
            cart_name = raw_input("Enter the name of your cart: ")
            user.make_cart(cart_name)
        elif choice_int == 2:
            print "I bought a widget."
	elif choice_int == 3:
	    user.carts_info()
	elif choice_int == 4:
	    print "Goodbye!"
	    break
        else:
            print "Invalid Choice!"
	    print "Try Again!"

I am not sure how to handle putting Widgets into a Cart.  Somehow, I need the user to be able to select the Cart he or she wants and then put Widgets in it.  Any hints?

Thanks!