《Python编程从入门到实践》第9章类动手试一试答案（附代码）
目录
9-1（9-2） 餐馆
9-3 用户
9-4 就餐人数
9-5 尝试登陆次数
9-6 冰淇淋小店
9-7 管理员
9-8 权限
9-10 导入Restaurant类
9-11 导入Admin类
9-12 多个模块
9-1（9-2） 餐馆
#!/usr/bin/env python
# -*- coding:utf-8 -*-
class Restaurant():
"""模拟餐馆信息的简单尝试"""
def __init__(self, restaurant_name, cuisine_type):
"""初始化描述汽车的属性"""
self.restaurant_name = restaurant_name
self.cuisine_type = cuisine_type
def describe_restaurant(self):
"""返回餐馆信息"""
long_name = self.restaurant_name + ' ' + self.cuisine_type
return long_name.title()
def open_restaurant(self):
"""打印餐厅营业消息"""
print("The restaurant is opening!!")
my_restaurant1 = Restaurant('美味', '炒菜')
print(my_restaurant1.describe_restaurant())
my_restaurant1.open_restaurant()
my_restaurant2 = Restaurant('香辣', '香锅')
print(my_restaurant2.describe_restaurant())
my_restaurant2.open_restaurant()
my_restaurant3 = Restaurant('欢欢', '火锅')
print(my_restaurant3.describe_restaurant())
my_restaurant3.open_restaurant()
运行结果：
9-3 用户
#!/usr/bin/env python
# -*- coding:utf-8 -*-
class User():
def __init__(self, first_name, last_name, age):
self.first_name = first_name
self.last_name = last_name
self.age = age
def describe_user(self):
"""描述用户信息"""
long_name = self.last_name + ' ' + self.first_name + ' ' + self.age
print(long_name.title())
def greet_user(self):
"""向用户问好"""
print('Hello,' + ' ' + self.last_name + ' ' + self.first_name + '!')
user = User('San', 'Zhang', '20')
user.describe_user()
user.greet_user()
运行结果：
9-4 就餐人数
#!/usr/bin/env python
# -*- coding:utf-8 -*-
class Restaurant():
"""模拟餐馆信息的简单尝试"""
def __init__(self, restaurant_name, cuisine_type):
"""初始化描述餐馆的属性"""
self.restaurant_name = restaurant_name
self.cuisine_type = cuisine_type
self.number_served = 0
def describe_restaurant(self):
"""返回餐馆信息"""
long_name = self.restaurant_name + ' ' + self.cuisine_type
return long_name.title()
def open_restaurant(self):
"""打印餐厅营业消息"""
print("The restaurant is opening!!")
def set_number_served(self, numbers):
"""设置就餐人数"""
self.number_served = numbers
def increment_number_served(self, numbers):
self.number_served += numbers
def read_number_served(self):
"""打印一条就餐人数信息"""
print("There are " + str(self.number_served) + ' people eating in this restaurant')
# 创建餐馆实例
my_restaurant = Restaurant('欢欢', '火锅')
# 打印餐馆信息
print(my_restaurant.describe_restaurant())
my_restaurant.open_restaurant()
# 打印初始餐馆就餐人数
my_restaurant.set_number_served(10)
my_restaurant.read_number_served()
# 打印认为的可能就餐人数
my_restaurant.increment_number_served(100)
my_restaurant.read_number_served()运行结果：
9-5 尝试登陆次数
#!/usr/bin/env python
# -*- coding:utf-8 -*-
class User():
def __init__(self, first_name, last_name, age):
self.first_name = first_name
self.last_name = last_name
self.age = age
self.login_attempts = 0
def describe_user(self):
"""描述用户信息"""
long_name = self.last_name + ' ' + self.first_name + ' ' + self.age
print(long_name.title())
def greet_user(self):
"""向用户问好"""
print('Hello,' + ' ' + self.last_name + ' ' + self.first_name + '!')
def increment_login_attempts(self):
"""计数登录次数"""
self.login_attempts += 1
def reset_login_attempts(self):
"""重置登录次数为0"""
self.login_attempts = 0
user = User('San', 'Zhang', '20')
# 打印用户信息并问好
user.describe_user()
user.greet_user()
# 多次调用increment_login_attempts
for i in range(1, 6):
user.increment_login_attempts()
print(user.login_attempts)
user.reset_login_attempts()
print("login_attempts重置为： " + str(user.login_attempts))
运行结果：
9-6 冰淇淋小店
#!/usr/bin/env python
# -*- coding:utf-8 -*-
class Restaurant():
"""模拟餐馆信息的简单尝试"""
def __init__(self, restaurant_name, cuisine_type):
"""初始化描述餐馆的属性"""
self.restaurant_name = restaurant_name
self.cuisine_type = cuisine_type
self.number_served = 0
def describe_restaurant(self):
"""返回餐馆信息"""
long_name = self.restaurant_name + ' ' + self.cuisine_type
return long_name.title()
def open_restaurant(self):
"""打印餐厅营业消息"""
print("The restaurant is opening!!")
def set_number_served(self, numbers):
"""设置就餐人数"""
self.number_served = numbers
def increment_number_served(self, numbers):
self.number_served += numbers
def read_number_served(self):
"""打印一条就餐人数信息"""
print("There are " + str(self.number_served) + ' people eating in this restaurant')
class IceCreamStand(Restaurant):
def __init__(self, restaurant_name, cuisine_type):
"""初始化父类的属性"""
super().__init__(restaurant_name, cuisine_type) # 初始化父类的属性
self.flavors = []
def set_flavors(self, flavors):
"""设置冰淇淋餐厅口味"""
self.flavors = flavors
def read_flavors(self):
"""打印餐厅冰淇淋口味"""
print('The taste of ice cream has：', end='')
for flavor in self.flavors:
print(flavor, end=' ')
# 创建冰淇淋餐厅实例
my_icecreamstand = IceCreamStand('欢欢', '冰淇淋')
# 打印冰淇淋信息
print(my_icecreamstand.describe_restaurant())
# 打印冰淇淋口味
my_icecreamstand.set_flavors(['蓝莓', '巧克力', '芒果'])
my_icecreamstand.read_flavors()运行结果：
9-7 管理员
#!/usr/bin/env python
# -*- coding:utf-8 -*-
class User():
"""用户类"""
def __init__(self, first_name, last_name, age):
self.first_name = first_name
self.last_name = last_name
self.age = age
self.login_attempts = 0
def describe_user(self):
"""描述用户信息"""
long_name = self.last_name + ' ' + self.first_name + ' ' + self.age
print(long_name.title())
def greet_user(self):
"""向用户问好"""
print('Hello,' + ' ' + self.last_name + ' ' + self.first_name + '!')
def increment_login_attempts(self):
"""计数登录次数"""
self.login_attempts += 1
def reset_login_attempts(self):
"""重置登录次数为0"""
self.login_attempts = 0
class Admin(User):
"""特殊用户Admin"""
"""初始化父类属性"""
def __init__(self, first_name, last_name, age):
super().__init__(first_name, last_name, age) # 初始化父类属性
self.privileges = ['can add post', 'can delete post', 'can ban user'] # Admin类特有的属性
def show_privileges(self):
print('管理员权限有：', end='')
for privilege in self.privileges:
print(privilege + ',', end=' ')
admin = Admin('San', 'Zhang', '20')
# 打印用户信息并问好
admin.describe_user()
admin.greet_user()
# 调用管理员权限方法
admin.show_privileges()
运行结果：
9-8 权限
#!/usr/bin/env python
# -*- coding:utf-8 -*-
class User():
"""用户类"""
def __init__(self, first_name, last_name, age):
self.first_name = first_name
self.last_name = last_name
self.age = age
self.login_attempts = 0
def describe_user(self):
"""描述用户信息"""
long_name = self.last_name + ' ' + self.first_name + ' ' + self.age
print(long_name.title())
def greet_user(self):
"""向用户问好"""
print('Hello,' + ' ' + self.last_name + ' ' + self.first_name + '!')
def increment_login_attempts(self):
"""计数登录次数"""
self.login_attempts += 1
def reset_login_attempts(self):
"""重置登录次数为0"""
self.login_attempts = 0
class Privileges():
"""权限类"""
def __init__(self):
self.privileges = ['can add post', 'can delete post', 'can ban user']
def show_privileges(self):
print('管理员权限有：', end='')
for privilege in self.privileges:
print(privilege + ',', end=' ')
class Admin(User):
"""特殊用户Admin"""
"""初始化父类属性"""
def __init__(self, first_name, last_name, age):
super().__init__(first_name, last_name, age) # 初始化父类属性
self.privileges = Privileges()
admin = Admin('San', 'Zhang', '20')
# 打印用户信息并问好
admin.describe_user()
admin.greet_user()
# 调用管理员权限方法,注意这里还需要privileges句点法调用show_privileges()
admin.privileges.show_privileges()运行结果：
9-10 导入Restaurant类
restaurant.py模块
#!/usr/bin/env python
# -*- coding:utf-8 -*-
class Restaurant():
"""模拟餐馆信息的简单尝试"""
def __init__(self, restaurant_name, cuisine_type):
"""初始化描述餐馆的属性"""
self.restaurant_name = restaurant_name
self.cuisine_type = cuisine_type
self.number_served = 0
def describe_restaurant(self):
"""返回餐馆信息"""
long_name = self.restaurant_name + ' ' + self.cuisine_type
return long_name.title()
def open_restaurant(self):
"""打印餐厅营业消息"""
print("The restaurant is opening!!")
def set_number_served(self, numbers):
"""设置就餐人数"""
self.number_served = numbers
def increment_number_served(self, numbers):
self.number_served += numbers
def read_number_served(self):
"""打印一条就餐人数信息"""
print("There are " + str(self.number_served) + ' people eating in this restaurant')
class IceCreamStand(Restaurant):
def __init__(self, restaurant_name, cuisine_type):
"""初始化父类的属性"""
super().__init__(restaurant_name, cuisine_type) # 初始化父类的属性
self.flavors = []
def set_flavors(self, flavors):
"""设置冰淇淋餐厅口味"""
self.flavors = flavors
def read_flavors(self):
"""打印餐厅冰淇淋口味"""
print('The taste of ice cream has：', end='')
for flavor in self.flavors:
print(flavor, end=' ')
主程序my_restaurant.py
#!/usr/bin/env python
# -*- coding:utf-8 -*-
from restaurant import IceCreamStand
# 创建冰淇淋餐厅实例
my_icecreamstand = IceCreamStand('欢欢', '冰淇淋')
# 打印冰淇淋信息
print(my_icecreamstand.describe_restaurant())
# 打印冰淇淋口味
my_icecreamstand.set_flavors(['蓝莓', '巧克力', '芒果', '草莓'])
my_icecreamstand.read_flavors()运行结果：
9-11 导入Admin类
admin.py模块
#!/usr/bin/env python
# -*- coding:utf-8 -*-
class User():
"""用户类"""
def __init__(self, first_name, last_name, age):
self.first_name = first_name
self.last_name = last_name
self.age = age
self.login_attempts = 0
def describe_user(self):
"""描述用户信息"""
long_name = self.last_name + ' ' + self.first_name + ' ' + self.age
print(long_name.title())
def greet_user(self):
"""向用户问好"""
print('Hello,' + ' ' + self.last_name + ' ' + self.first_name + '!')
def increment_login_attempts(self):
"""计数登录次数"""
self.login_attempts += 1
def reset_login_attempts(self):
"""重置登录次数为0"""
self.login_attempts = 0
class Privileges():
"""权限类"""
def __init__(self):
self.privileges = ['can add post', 'can delete post', 'can ban user']
def show_privileges(self):
print('管理员权限有：', end='')
for privilege in self.privileges:
print(privilege + ',', end=' ')
class Admin(User):
"""特殊用户Admin"""
"""初始化父类属性"""
def __init__(self, first_name, last_name, age):
super().__init__(first_name, last_name, age) # 初始化父类属性
self.privileges = Privileges()主程序my_admin.py
#!/usr/bin/env python
# -*- coding:utf-8 -*-
# 从admin模块导入Admin类
from admin import Admin
admin = Admin('Si', 'Li', '20')
# 打印用户信息并问好
admin.describe_user()
admin.greet_user()
# 调用管理员权限方法,注意这里还需要privileges句点法调用show_privileges()
admin.privileges.show_privileges()
运行结果：
9-12 多个模块
user.py模块
#!/usr/bin/env python
# -*- coding:utf-8 -*-
class User():
"""用户类"""
def __init__(self, first_name, last_name, age):
self.first_name = first_name
self.last_name = last_name
self.age = age
self.login_attempts = 0
def describe_user(self):
"""描述用户信息"""
long_name = self.last_name + ' ' + self.first_name + ' ' + self.age
print(long_name.title())
def greet_user(self):
"""向用户问好"""
print('Hello,' + ' ' + self.last_name + ' ' + self.first_name + '!')
def increment_login_attempts(self):
"""计数登录次数"""
self.login_attempts += 1
def reset_login_attempts(self):
"""重置登录次数为0"""
self.login_attempts = 0admin.py模块
#!/usr/bin/env python
# -*- coding:utf-8 -*-
# 从user模块导入User类
from user import User
class Privileges():
"""权限类"""
def __init__(self):
self.privileges = ['can add post', 'can delete post', 'can ban user']
def show_privileges(self):
print('管理员权限有：', end='')
for privilege in self.privileges:
print(privilege + ',', end=' ')
class Admin(User):
"""特殊用户Admin"""
"""初始化父类属性"""
def __init__(self, first_name, last_name, age):
super().__init__(first_name, last_name, age) # 初始化父类属性
self.privileges = Privileges()主程序my_admin.py
#!/usr/bin/env python
# -*- coding:utf-8 -*-
# 从admin模块导入Admin类
from admin import Admin
admin = Admin('Hua', 'Li', '15')
# 打印用户信息并问好
admin.describe_user()
admin.greet_user()
# 调用管理员权限方法,注意这里还需要privileges句点法调用show_privileges()
admin.privileges.show_privileges()运行结果：
