Python从入门到实践第九章-类

9-1

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.title())
        print(self.cuisine_type.title())
    def open_restaurant(self):
        print("The restaurant is opening")
restaurant = Restaurant(‘quanjude‘,‘kaoya‘)
restaurant.describe_restaurant()
restaurant.open_restaurant()

9-2略

9-3      数字实参不加引号   好像是这样的。。因为报了错

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):
        print(‘Name: ‘ +self.last_name + self.first_name+ ‘ age : ‘ + str(self.age) )

    def greet_user(self):
        print(‘Hello！ ‘ + self.last_name + self.first_name)
user_a = User(‘xiangnai‘, ‘taonaimu‘,‘22‘)
user_b = User(‘yongmei‘, ‘shentian‘,‘23‘)
user_a.describe_user()
user_b.describe_user()
user_a.greet_user()
user_b.greet_user()

9-4 写95的时候发现这个题没看到后面的  不过和95差不多不补了

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.title())
        print(self.cuisine_type.title())
    def open_restaurant(self):
        print("The restaurant is opening")
    def read_serve_number(self):
        print("The numer restanrant serverd is " + 
                str(self.number_served))
restaurant = Restaurant(‘restaurant‘,‘aaa‘)
restaurant.describe_restaurant()
restaurant.read_serve_number()
restaurant.number_served = 20
restaurant.read_serve_number()
输出：
Restaurant
Aaa
The numer restanrant serverd is 0
The numer restanrant serverd is 20

9-5

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_attemps = 0
    def describe_user(self):
        print(‘Name: ‘ +self.last_name + self.first_name+ ‘ age : ‘ + str(self.age) )

    def greet_user(self):
        print(‘Hello！ ‘ + self.last_name + self.first_name)
        
    def increment_login_attemps(self):
        self.login_attemps += 1

    def read_login(self):
        print("Now the number of people logining is " + str(self.login_attemps))
        
    def reset_login(self):
        self.login_attemps = 0
user_a = User(‘san‘,‘zhang‘,‘20‘)
user_a.increment_login_attemps()
user_a.increment_login_attemps()
user_a.increment_login_attemps()
user_a.increment_login_attemps()
user_a.read_login()
user_a.reset_login()
user_a.read_login()
输出：
Now the number of people logining is 4
Now the number of people logining is 0

 9-6

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.title())
        print(self.cuisine_type.title())
    def open_restaurant(self):
        print("The restaurant is opening")
class IceCreamStand(Restaurant):
    def __init__(self,restaurant_name,cuisine_type):
        super().__init__(restaurant_name,cuisine_type)
        self.flavors = []
    def set_flavors(self,flavors):
        self.flavors = flavors 
    def describe_flavors(self):
        print("This is the flavors:" + str(self.flavors))#这里一开始没加str报错 can only concatenate str (not "list") to str  不懂为啥
Newres = IceCreamStand(‘quanjude‘,‘kaoya‘)
Newres.set_flavors([‘apple‘,‘orange‘,‘banana‘])
Newres.describe_flavors()
输出：
This is the flavors:[‘apple‘, ‘orange‘, ‘banana‘]

9-7  看别人的学了一手 end=‘‘， 可以继续后面print的内容 挺好用  

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_attemps = 0
    def describe_user(self):
        print(‘Name: ‘ +self.last_name + self.first_name+ ‘ age : ‘ + str(self.age) )

    def greet_user(self):
        print(‘Hello！ ‘ + self.last_name + self.first_name)
        
    def increment_login_attemps(self):
        self.login_attemps += 1

    def read_login(self):
        print("Now the number of people logining is " + str(self.login_attemps))
        
    def reset_login(self):
        self.login_attemps = 0
class Admin(User):
    def __init__(self, first_name, last_name, age):
        super().__init__(first_name, last_name, age)  
 
        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=‘ ‘)
 
 
admin = Admin(‘San‘, ‘Zhang‘, ‘20‘)
admin.show_privileges()
输出：
管理员权限有：can add post, can delete post, can ban user,

9-8 略 编写一个类，然后admin中 self.pr... = pr...()

9-9

def upgrade_battery(self):
        if self.battery_size!=85:
            self.battery_size=85

9-14

from random import randint

class Die():
    def __init__(self,sides=6):
        self.sides = sides
    def roll_die(self):
        print(randint(1,self.sides))
die_six = Die(6)
for i in range(10):
    die_six.roll_die()
die_ten = Die(10)
for i in range(10):
    die_ten.roll_die()
die_20 = Die(20)
for i in range(10):
    die_20.roll_die()

有点3分钟的感觉了。。要认真一点。