《Python编程：从入门到实践》课后习题-第9章

最新推荐文章于 2023-09-07 16:05:55 发布

Million Reasons

最新推荐文章于 2023-09-07 16:05:55 发布

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本文通过实例演示了如何使用Python创建餐厅和用户类，并实现不同功能，如描述餐厅、记录就餐人数、展示用户信息及权限等。

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9-1 餐馆

#9-1 餐馆

class Restaurant():

    def __init__(self,restaurant_name,cuisine_type):
        self.restaurant_name = restaurant_name
        self.cuisine_type = cuisine_type

    def describe_restaurant(self):
        print(self.restaurant_name)
        print(self.cuisine_type)

    def open_restaurant(self):
        print("餐馆正在营业。")

restaurant = Restaurant('KFC','fast food')
print(restaurant.restaurant_name)
print(restaurant.cuisine_type)
restaurant.describe_restaurant()
restaurant.open_restaurant()

9-2 三家餐馆

#9-2 三家餐馆

class Restaurant():

    def __init__(self,restaurant_name,cuisine_type):
        self.restaurant_name = restaurant_name
        self.cuisine_type = cuisine_type

    def describe_restaurant(self):
        print(self.restaurant_name)
        print(self.cuisine_type)

    def open_restaurant(self):
        print("餐馆正在营业。")

restaurant1 = Restaurant('KFC','fast food')
restaurant2 = Restaurant('Quanjude','Peking Duck')
restaurant3 = Restaurant('Shaxian County snacks','snacks')
restaurant1.describe_restaurant()
restaurant2.describe_restaurant()
restaurant3.describe_restaurant()

9-3 用户

#9-3 用户

class User():
    """存储并打印用户信息与属性"""
    def __init__(self,first_name,last_name,age,city):
        self.first_name = first_name
        self.last_name = last_name
        self.age = str(age)
        self.city = city

    def describe_user(self):
        """打印用户信息摘要。"""
        print("User's name is " + self.first_name.title() + " " + self.last_name.title() + ".")
        print("User's age is " + self.age + ".")
        print("User comes from " + self.city)

    def greet_user(self):
        """向用户发出个性化的问候。"""
        print("Hello dear " + self.first_name.title() + " " +  self.last_name.title() + "!")

person1 = User('jane','zhang',35,'Chengdu')
person2 = User('rosalyn','yu',21,'Wuhan')
person3 = User('Stefani Joanne Angelina','Germanotta',33,'New York')
User.describe_user(person1)
User.greet_user(person1)
User.describe_user(person2)
User.greet_user(person2)
User.describe_user(person3)
User.greet_user(person3)

9-4 就餐人数

#9-4 就餐人数

class Restaurant():

    def __init__(self,restaurant_name,cuisine_type,):
        self.restaurant_name = restaurant_name
        self.cuisine_type = cuisine_type
        self.number_served = 0

    def describe_restaurant(self):
        print(self.restaurant_name)
        print(self.cuisine_type)
        print(str(self.number_served) + "人在这里就餐过。")

    def open_restaurant(self):
        print("餐馆正在营业。")

    def set_number_served(self,number):
        """设置就餐人数"""
        print("就餐人数：" + str(number) + ".")

    def increment_number_served(self,increment_number):
        """将就餐人数递增"""
        self.number_served += increment_number

restaurant = Restaurant('KFC','fast food')
restaurant.describe_restaurant()
restaurant.number_served = 200
restaurant.describe_restaurant()
restaurant.set_number_served(5)
restaurant.increment_number_served(20)
restaurant.describe_restaurant()

9-5 尝试登陆次数

#9-5 尝试登陆次数

class User():
    """存储并打印用户信息与属性"""
    def __init__(self,first_name,last_name,age,city,login_attempts):
        self.first_name = first_name
        self.last_name = last_name
        self.age = str(age)
        self.city = city
        self.login_attempts = 0

    def describe_user(self):
        """打印用户信息摘要。"""
        print("用户名：" + self.first_name.title() + " " + self.last_name.title() + ".")
        print("年龄：" + self.age + ".")
        print("地区：" + self.city)
        print("用户尝试登入次数：" + str(self.login_attempts))

    def greet_user(self):
        """向用户发出个性化的问候。"""
        print("欢迎" + self.first_name.title() + " " +  self.last_name.title() + "！")

    def increment_login_attempts(self):
        self.login_attempts += 1

    def reset_login_attempts(self):
        self.login_attempts = 0

person = User('jane','zhang',35,'Chengdu',0)
person.increment_login_attempts()
person.increment_login_attempts()
person.increment_login_attempts()
person.increment_login_attempts()
person.increment_login_attempts()
person.describe_user()
person.reset_login_attempts()
person.describe_user()

9-6 冰淇淋小店

#9-6 冰淇淋小店

class Restaurant():

    def __init__(self,restaurant_name,cuisine_type):
        self.restaurant_name = restaurant_name
        self.cuisine_type = cuisine_type

    def describe_restaurant(self):
        print("Restaurant's name is " + self.restaurant_name + ".")
        print("Restaurant's cuisine type is " + self.cuisine_type + ".")

    def open_restaurant(self):
        print("Restaurant is opening.")

class IceCreamStand(Restaurant):
    """冰淇淋小店"""

    def __init__(self,restaurant_name,cuisine_type,*flavors):
        """初始化父类的属性"""
        super().__init__(restaurant_name,cuisine_type)
        self.flavors = flavors

    def describe_flavors(self):
        print("The ice cream has follow flavors: ")
        for i in self.flavors:
            print(i)

ice_cream = IceCreamStand('Haagen-Dazs','ice cream','Vanilla','Strawberry','chocolate')
ice_cream.describe_flavors()

9-7 管理员

#9-7 管理员

class User():
    """存储并打印用户信息与属性"""
    def __init__(self,first_name,last_name,age,city):
        self.first_name = first_name
        self.last_name = last_name
        self.age = str(age)
        self.city = city

    def describe_user(self):
        """打印用户信息摘要。"""
        print("User's name is " + self.first_name.title() + " " + self.last_name.title() + ".")
        print("User's age is " + self.age + ".")
        print("User comes from " + self.city)

    def greet_user(self):
        """向用户发出个性化的问候。"""
        print("Hello dear " + self.first_name.title() + " " +  self.last_name.title() + "!")

class Admin(User):

    def __init__(self,first_name,last_name,age,city,*privileges):
        super().__init__(first_name,last_name,age,city)
        self.privileges = privileges

    def show_privileges(self):
        print("管理员的权限如下：")
        for i in self.privileges:
            print(i)

user = Admin('rosalyn','yu',21,'Wuhan','can add post','cab delete post','can ban user')
user.show_privileges()

9-8 权限

#9-8 权限

class User():
    """存储并打印用户信息与属性"""
    def __init__(self,first_name,last_name,age,city):
        self.first_name = first_name
        self.last_name = last_name
        self.age = str(age)
        self.city = city

    def describe_user(self):
        """打印用户信息摘要。"""
        print("User's name is " + self.first_name.title() + " " + self.last_name.title() + ".")
        print("User's age is " + self.age + ".")
        print("User comes from " + self.city)

    def greet_user(self):
        """向用户发出个性化的问候。"""
        print("Hello dear " + self.first_name.title() + " " +  self.last_name.title() + "!")

class Privileges():

    def __init__(self,privileges = ['can add post','cab delete post','can ban user']):
        self.privileges  = privileges

    def show_privileges(self):
        print("管理员拥有所有的权限：" )
        for j in self.privileges:
            print(j)

class Admin(User):

    def __init__(self,first_name,last_name,age,city):
        super().__init__(first_name,last_name,age,city)
        self.privileges = Privileges()

user = Admin('rosalyn','yu',21,'wuhan')
user.privileges.show_privileges()

9-9 电瓶升级

#9-9 电瓶升级

class Car():
    """一次模拟汽车的简单尝试"""

    def __init__(self,make,model,year):
        self.make = make
        self.model = model
        self.year = year
        self.odometer_reading = 0

    def get_descriptive_name(self):
        long_name = str(self.year) + ' ' + self.make + ' ' + self.model
        return long_name.title()

    def read_odometer(self):
        print("This car has " + str(self.odometer_reading) + " miles on it.")

    def update_odometer(self,mileage):
        if mileage >= self.odometer_reading:
            self.odometer_reading = mileage
        else:
            print("You can't roll back an odometer!")

    def increment_odometer(self,miles):
        self.odometer_reading += miles

class Battery():
    """一次模拟电动汽车电瓶的简单尝试"""
    def __init__(self,battery_size = 70):
        """初始化电瓶的属性"""
        self.battery_size = battery_size

    def describe_battery(self):
        """打印一条描述电瓶容量的消息"""
        print("This car has a " + str(self.battery_size) + "-KWH battery.")

    def get_range(self):
        """打印一条消息，指出电瓶的续航里程"""
        if self.battery_size == 70:
            range = 240
        elif self.battery_size == 85:
            range = 270

        message = "This car can go approximately " + str(range)
        message += " miles on a full charge."
        print(message)

    def upgrade_battery(self):
        """检查电瓶容量"""
        if self.battery_size != 85:
            self.battery_size = 85

class ElectricCar(Car):
    """电动汽车的独特之处"""
    def __init__(self,make,model,year):
        """初始化父类的属性，再初始化电动汽车特有的属性"""
        super().__init__(make,model,year)
        self.battery = Battery()

user_car = ElectricCar('tesla','model s',2016)
user_car.battery.get_range()
user_car.battery.upgrade_battery()
user_car.battery.get_range()

9-10 导入Restaurant类

#9-10 导入Restaurant类

from restaurant import Restaurant

my_restaurant = Restaurant('KFC','fast food')
my_restaurant.describe_restaurant()
my_restaurant.open_restaurant()

9-11 导入Admin类

#9-11 导入Admin类

from admin import Admin

users = Admin('rosalyn','yu',21,'Wuhan')
users.privileges.show_privileges()

9-12 多个模块

#9-12 多个模块

from user import *
from admin import *

users = Admin('rosalyn','yu',21,'Wuhan')
users.privileges.show_privileges()

9-13 使用OrderedDict

#9-13 使用OrderedDict

from collections import OrderedDict

dic = OrderedDict()
dic['lower'] = '全部小写'
dic['sort'] = '永久性排序'
dic['strip'] = '删除首尾空白'
dic['title'] = '首字母大写'
dic['pop'] = '删除'
dic['min']='最小值'
dic['max']='最大值'
dic['sum']='总和'
dic['insert']='插入元素'
dic['sorted']='临时排序'

for key,value in dic.items():
    print("语法" + key + "的意思是：" + value + "。")

9-14 骰子

#9-14 骰子

from random import randint

class Die():

    def __init__(self,sides = 6):
        self.sides = sides

    def roll_die(self):
        """打印位于1和骰子面数之间的随机数"""
        x = randint(1,self.sides)
        print(x)

my_die = Die()
for i in range(1,11):
    i = my_die.roll_die()
print("\n")
my_die = Die(10)
for i in range(1,11):
    i = my_die.roll_die()
print("\n")
my_die = Die(20)
for i in range(1,11):
    i = my_die.roll_die()