python-patterns/mvc.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
 
class Model(object):
 
    products = {
            'milk': { 'price': 1.50, 'quantity': 10 },
            'eggs': { 'price': 0.20, 'quantity': 100 },
            'cheese': { 'price': 2.00, 'quantity': 10 }
    }


class View(object):
 
    def product_list(self, product_list):
        print('PRODUCT LIST:')
        for product in product_list:
            print(product)
        print('')
 
    def product_information(self, product, product_info):
        print('PRODUCT INFORMATION:')
        print('Name: %s, Price: %.2f, Quantity: %d\n' % \
              (product.title(), product_info.get('price', 0), \
               product_info.get('quantity', 0)))

    def product_not_found(self, product):
        print('That product "%s" does not exist in the records' % product)


class Controller(object):
 
    def __init__(self):
        self.model = Model()
        self.view = View()
 
    def get_product_list(self):
        product_list = self.model.products.keys()
        self.view.product_list(product_list)
 
    def get_product_information(self, product):
        product_info = self.model.products.get(product, None)
        if product_info is not None:
            self.view.product_information(product, product_info)
        else:
            self.view.product_not_found(product)
 
 
if __name__ == '__main__':
 
    controller = Controller()
    controller.get_product_list()
    controller.get_product_information('cheese')
    controller.get_product_information('eggs')
    controller.get_product_information('milk')
    controller.get_product_information('arepas')