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—courseware:python_programming:resources:answer:23 [2022/07/19 17:51] (فعلی) – ایجاد شد - ویرایش خارجی 127.0.0.1
خط 1: خط 1:
 +==== پاسخ تمرین فروشگاه شی‌گرا ====
  
 +فایل model.py:
 +
 +
 +<code python line-numbers="true">
 +from time import strftime
 +import statistics
 +
 +
 +class User:
 +    """
 +    User model which includes username of the client
 +    """
 +
 +    def __init__(self, username: str):
 +        self.username = username
 +
 +    def __str__(self):
 +        return self.username
 +
 +
 +class Product:
 +    """
 +    Product model which includes products' data
 +    """
 +
 +    num_of_products = 0
 +
 +    def __init__(self, name: str, price: int):
 +        Product.num_of_products += 1
 +        self.id = Product.num_of_products
 +        self.name = name
 +        self.price = price
 +        self.quantities = {}
 +
 +    def __str__(self):
 +        return str((self.id, self.name, self.price))
 +
 +    def add_quantity(self, store, number):
 +        if store in self.quantities.keys():
 +            new_quantity = self.quantities[store] + number
 +            if new_quantity >= 0:
 +                self.quantities[store] = new_quantity
 +            else:
 +                raise Exception('Quantity is not enough!')
 +        else:
 +            self.quantities[store] = number
 +
 +    @property
 +    def quantity(self):
 +        return sum(self.quantities.values())
 +
 +    def __str__(self):
 +        return str((self.id, self.name, self.price))
 +
 +
 +class Purchase:
 +    """
 +    Purchase model includes:
 +    - Who purchased? user.
 +    - Which product? product.
 +    - From which store? store.
 +    - How many? number.
 +    - When? date.
 +
 +    And it has a container for all registered purchases.
 +    """
 +
 +    purchases = list()
 +
 +    def __init__(self, product: Product, store: str, number: int, user: User,
 +                 date: str = strftime('%Y-%m-%d %H:%M:%S')):
 +        if product.quantities[store] - number < 0:
 +            raise Exception('Quantity is not enough!')
 +        self.product = product
 +        self.store = store
 +        self.number = number
 +        self.user = user
 +        self.date = date
 +
 +        product.add_quantity(store, -number)
 +        Purchase.purchases.append(self)
 +
 +    def __str__(self):
 +        return (str(self.product), self.store, self.number, str(self.user), self.date).__str__()
 +
 +    @classmethod
 +    def store_revenue(cls, store):
 +        return sum(
 +            purchase.product.price * purchase.number
 +            for purchase in cls.purchases
 +            if purchase.store == store
 +        )
 +
 +    @classmethod
 +    def users_purchased_product(cls, product):
 +        return [purchase.user for purchase in cls.purchases if purchase.product == product]
 +
 +
 +class Comment:
 +    """
 +    Comments model includes:
 +    - who wrote the comment? user.
 +    - what rate the user is given? rating.
 +    - comment is written for which product? product.
 +    - text of the comment? text.
 +    """
 +
 +    comments = list()
 +
 +    def __init__(self, user: User, product: Product, rating: int, text: str = ''):
 +        self.user = user
 +        self.rating = rating
 +        self.product = product
 +        self.text = text
 +        Comment.comments.append(self)
 +
 +    def __str__(self):
 +        return "user: %s \n product: %s \n rating: %d \n text: %s" % (self.user, self.product, self.rating, self.text)
 +
 +    @classmethod
 +    def user_comments(cls, user):
 +        return [comment for comment in cls.comments if comment.user == user]
 +
 +    @classmethod
 +    def average_rate_purchased_product(cls, product):
 +        return statistics.mean([comment.rating for comment in cls.comments if comment.product == product])
 +
 +</code>
 +
 +فایل store.py:
 +
 +<code python line-numbers="true">
 +from model import User, Product, Purchase, Comment
 +
 +
 +def main():
 +    done = False
 +    while not done:
 +        action = input("""
 +        1 add user
 +        2 purchase
 +        3 add product
 +        4 add comment
 +        5 calculate revenue
 +        6 print users
 +        7 end
 +        """)
 +        done = action == 7
 +
 +    user = User('Masoud')
 +    product = Product('Gorbe', 1000)
 +    Purchase(product, 'Sharif', 2, user)
 +    Comment(user, 5, product, 'Gorbe is good.')
 +
 +
 +if __name__ == '__main__':
 +    main()
 +
 +</code>