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。
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