实验题目： 1、分别实现产品类和用户类，产品对象包含产品名称、产品重量和产品价格等；用户对象包含用户名称；用户对象可以向产品对象询问价格，产品对象接到询价时会回答该产品的价格。 2、类图 3、序列图

1. 代码实现：

class Product:
    def __init__(self, name, weight, price):
        self.name = name
        self.weight = weight
        self.price = price

    def get_price(self):
        return self.price


class User:
    def __init__(self, name):
        self.name = name

    def ask_price(self, product):
        return product.get_price()

2. 类图：

+----------+            +-----------+
|  Product |            |    User   |
+----------+            +-----------+
|  name    |            |   name    |
|  weight  |            +-----------+
|  price   |
+----------+
| get_price()|
+----------+
| ask_price()|
+-----------+

3. 序列图：

              +-----------+             +----------+
              |   User    |             | Product  |
              +-----------+             +----------+
                   |                          |
                   | ask_price(product)       |
                   |------------------------>|
                   |                          |
                   |      get_price()          |
                   |<------------------------|
                   |                          |