《Python编程：从入门到实践》答案

电玩女神 2022-12-05 15:15 297阅读 0赞

> *i人生总会有让你不舒服的事，不要在它上纠结，把时间浪费在你想做的事上。*

# 第九章 #

![20200911074606956.png][]

出错点：

1、\_\_init\_\_()两边的下划线是两个！

2、两个方法里忘记了加self

![20200911085115246.png][]

class Restaruarant():
    	def __init__(self,restaurant_name,cuisine_type):
    		self.restaurant_name=restaurant_name
    		self.cuisine_type=cuisine_type
    	def describe_restaurant(self):
    		print("The cuisine_type is: "+self.cuisine_type)
    		print("The restaurant_name is: "+self.restaurant_name)
    	def open_restaurant(self):
    		print("We are in business.")
    R1=Restaruarant('客来','东北菜')
    print(R1.restaurant_name+" is good at "+R1.cuisine_type+".")
    
    R1.describe_restaurant()
    R1.open_restaurant()
    
    print("\n")
    R2=Restaruarant('红旗','东北菜')
    R3=Restaruarant('山西','刀削面')
    R4=Restaruarant('西北','兰州拉面')
    
    
    R2.describe_restaurant()
    R2.open_restaurant()
    
    R3.describe_restaurant()
    R3.open_restaurant()
    
    R4.describe_restaurant()
    R4.open_restaurant()

![20200911085513586.png][]

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("first name is "+self.first_name)
    		print("last name is "+self.last_name)
    		print("age is "+str(self.age))
    	def greet_user(self):
    		full_name=self.first_name+" "+self.last_name
    		print("Welcome you ,"+full_name+" ,have a nice day .")
    
    user1=User('张','宸宸',23)
    user1.greet_user()
    user1.describe_user()
    
    user2=User('王','舍',24)
    user2.greet_user()
    user2.describe_user()
    
    user3=User('肖','大在',83)
    user3.greet_user()
    user3.describe_user()

【注意】每个属性前面都是要加self.的。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NodXl1ZGV4aWFvd3U_size_16_color_FFFFFF_t_70][]

class Restaruarant():
    	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("The cuisine_type is: "+self.cuisine_type)
    		print("The restaurant_name is: "+self.restaurant_name)
    	def open_restaurant(self):
    		print("We are in business.")
    	def set_number_served(self,num):
    		self.number_served=num
    	def increment_number_served(self,num):
    		self.number_served+=num
    		
    		
    R1=Restaruarant('客来','东北菜')
    print(R1.restaurant_name+" is good at "+R1.cuisine_type+
    		"and "+str(R1.number_served)+" people have been came here.")
    R1.set_number_served(3000)
    print(R1.restaurant_name+" is good at "+R1.cuisine_type+
    		"and "+str(R1.number_served)+" people have been came here.")
    
    R1.increment_number_served(30)
    print(R1.restaurant_name+" is good at "+R1.cuisine_type+
    		"and "+str(R1.number_served)+" people have been came here.")

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NodXl1ZGV4aWFvd3U_size_16_color_FFFFFF_t_70 1][]

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 increment_login_attempts(self):
    		self.login_attempts+=1
    	def reset_login_attempts(self):
    		self.login_attempts=0
    	
    	def describe_user(self):
    		print("first name is "+self.first_name)
    		print("last name is "+self.last_name)
    		print("age is "+str(self.age))
    	def greet_user(self):
    		full_name=self.first_name+" "+self.last_name
    		print("Welcome you ,"+full_name+" ,have a nice day .")
    
    user1=User('张','宸宸',23)
    print(user1.login_attempts)
    user1.increment_login_attempts();
    user1.increment_login_attempts();
    user1.increment_login_attempts();
    user1.increment_login_attempts();
    print(user1.login_attempts)
    user1.reset_login_attempts();
    print(user1.login_attempts)

![2020091111121961.png][]

class Restaruarant():
    	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("The cuisine_type is: "+self.cuisine_type)
    		print("The restaurant_name is: "+self.restaurant_name)
    	def open_restaurant(self):
    		print("We are in business.")
    	def set_number_served(self,num):
    		self.number_served=num
    	def increment_number_served(self,num):
    		self.number_served+=num
    		
    class IceCreamStand(Restaruarant):
    	def __init__(self,restaurant_name,cuisine_type):
    		super().__init__(restaurant_name,cuisine_type)
    		self.flavors=['strawberry','berry','grape','banana']
    	def show_Ice(self):
    		for key in self.flavors:
    			print(key)
    	
    My_Ice=IceCreamStand('客来','东北菜')
    My_Ice.show_Ice()

![20200911112317627.png][]

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 increment_login_attempts(self):
    		self.login_attempts+=1
    	def reset_login_attempts(self):
    		self.login_attempts=0
    	
    	def describe_user(self):
    		print("first name is "+self.first_name)
    		print("last name is "+self.last_name)
    		print("age is "+str(self.age))
    	def greet_user(self):
    		full_name=self.first_name+" "+self.last_name
    		print("Welcome you ,"+full_name+" ,have a nice day .")
    
    class Admin(User):
    	def __init__(self,first_name,last_name,age):
    		super().__init__(first_name,last_name,age)
    		self.privileges=["can ban user",'can delete post','can add post']
    	def show_privileges(self):
    		for key in self.privileges:
    			print(key)
    		
    Admin1=Admin('张','宸宸',23)
    Admin1.show_privileges()

【注意】super().\_\_init\_\_()的写法。、

![20200911114353137.png][]

class Privileges():
    	def __init__(self):
    		self.privileges=["can ban user",'can delete post','can add post']
    		
    	def show_privileges(self):
    		for key in self.privileges:
    			print(key)
    
    
    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 increment_login_attempts(self):
    		self.login_attempts+=1
    	def reset_login_attempts(self):
    		self.login_attempts=0
    	
    	def describe_user(self):
    		print("first name is "+self.first_name)
    		print("last name is "+self.last_name)
    		print("age is "+str(self.age))
    	def greet_user(self):
    		full_name=self.first_name+" "+self.last_name
    		print("Welcome you ,"+full_name+" ,have a nice day .")
    
    class Admin(User):
    	def __init__(self,first_name,last_name,age):
    		super().__init__(first_name,last_name,age)
    		self.privileges=Privileges()
    
    		
    Admin1=Admin('张','宸宸',23)
    Admin1.privileges.show_privileges()

【注意】

1、把某个函数抽取出来之后要把原函数删除。

2、当把一个类的实例用作了属性时，调用这个成为属性的类中的方法要用【类 . 属性名 . 被当成属性的类的方法】而不能直接由类调用被当成属性的类的方法。

3、被当成属性的类要写在最上边，先加载。

![20200911115501876.png][]

class Car():
    	def __init__(self,made,model,year):
    		self.made=made
    		self.model=model
    		self.year=year
    	
    	def descriptive_name(self):
    		long_name=str(self.year)+' '+self.made+' '+self.model
    		return long_name.title()
    	
    class Battery():
    	def __init__(self,battery=70):
    		self.battery=battery
    		
    	def describe_battery(self):
    		print("This car has a "+str(self.battery)+"-kwh battery")
    	def get_range(self):
    		if self.battery==70:
    			range=240
    		elif self.battery==85:
    			range=270
    		message="This car can go "+str(range)
    		message+=" miles on a full charge."
    		print(message)
    	def update_battery(self):
    		if self.battery!=85:
    			self.battery=85
    
    class EleCar(Car):
    	def __init__(self,made,model,year):
    		super().__init__(made,model,year)
    		self.battery=Battery()
    
    new_eleCar=EleCar("Audi","s450",4)
    new_eleCar.battery.get_range()
    new_eleCar.battery.update_battery()
    new_eleCar.battery.get_range()

![20200913082232712.png][]

#Restaurant.py
    class Restaurant():
    	def __init__(self,name,make,model,year):
    		self.name=name
    		self.make=make
    		self.model=model
    		self.year=year
    	
    	def show_detils(self):
    		print(str(self.year)+" , "+self.name+" , "+self.model+" , "+self.make)

from Restaurant import Restaurant
    my_class=Restaurant('Benz','China','s-450','2016')
    my_class.show_detils()

![2020091308234065.png][]

#模块
    class Privileges():
    	def __init__(self):
    		self.privileges=["can ban user",'can delete post','can add post']
    		
    	def show_privileges(self):
    		for key in self.privileges:
    			print(key)
    
    
    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 increment_login_attempts(self):
    		self.login_attempts+=1
    	def reset_login_attempts(self):
    		self.login_attempts=0
    	
    	def describe_user(self):
    		print("first name is "+self.first_name)
    		print("last name is "+self.last_name)
    		print("age is "+str(self.age))
    	def greet_user(self):
    		full_name=self.first_name+" "+self.last_name
    		print("Welcome you ,"+full_name+" ,have a nice day .")
    
    class Admin(User):
    	def __init__(self,first_name,last_name,age):
    		super().__init__(first_name,last_name,age)
    		self.privileges=Privileges()

from ex911 import User,Privileges,Admin 
    Admin1=Admin('张','宸宸',23)
    Admin1.privileges.show_privileges()

![20200913084655256.png][]

from ex913 import User
    class Privileges():
    	def __init__(self):
    		self.privileges=["can ban user",'can delete post','can add post']
    		
    	def show_privileges(self):
    		for key in self.privileges:
    			print(key)
    
    
    class Admin(User):
    	def __init__(self,first_name,last_name,age):
    		super().__init__(first_name,last_name,age)
    		self.privileges=Privileges()

from ex911 import Privileges,Admin 
    from ex913 import User
    Admin1=Admin('张','宸宸',23)
    Admin1.privileges.show_privileges()

![20200913085832467.png][]

from collections import OrderedDict
    #创建三个同学，把他们放在一个班级里,遍历出所有同学，
    #错误1 把班级写成了class，整成了Python中的关键字。
    #错误2 内部的字典最后一个键值对后面也是有逗号的。
    #错误3 “good at ”在字典中写的时候后面是有空格的，但for 循环中忘记写了。
    
    
    classes = OrderedDict()
    classes['s1']={
    		'name':'Zhang',
    		'num':'001',
    		'age':'18',
    		'good at ':'math',
    	}
    classes['s2']={
    		'name':'Wang',
    		'num':'002',
    		'age':'16',
    		'good at ':'Chinese',
    	}
    classes['s3']={
    		'na3e':'Li',
    		'num':'003',
    		'age':'17',
    		'good at ':'Python',
    	}
    
    
    for name,info in classes.items():
    	print('\nStudent name is : '+name)
    	print('\tStudent number is : '+info['num'])
    	print('\tStudent age is : '+info['age'])
    	print('\tStudent goot at is : '+info['good at '])

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NodXl1ZGV4aWFvd3U_size_16_color_FFFFFF_t_70 2][]

from random import randint
    
    class Die():
    	def __init__(self):
    		self.sides=6
    	def show_die(self):
    		self.sides=randint(1,6)
    		print(self.sides)
    
    ex=Die()
    for i in range(1,11):
    	ex.show_die()
    	
    class Die2():
    	def __init__(self):
    		self.sides=6
    	def show_die(self):
    		self.sides=randint(1,11)
    		print(self.sides)
    
    ex2=Die2()
    for i in range(1,11):
    	ex2.show_die()

[20200911074606956.png]: /images/20221123/f57246ccd11146108993ec50237bbe42.png
[20200911085115246.png]: /images/20221123/fed24cd36a5349758bc0b8c0c2de9e51.png
[20200911085513586.png]: /images/20221123/1692252f4ddc4a97ab96226cd45297eb.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NodXl1ZGV4aWFvd3U_size_16_color_FFFFFF_t_70]: /images/20221123/6ec6caffa1934fd6a166a5541bcb88db.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NodXl1ZGV4aWFvd3U_size_16_color_FFFFFF_t_70 1]: /images/20221123/8842f4708e0340a493b4248b02bf3a49.png
[2020091111121961.png]: /images/20221123/f5e26a8181944c76ac234ebb4af06132.png
[20200911112317627.png]: /images/20221123/7845ee3e96eb4d9db0564bd57f923db7.png
[20200911114353137.png]: /images/20221123/84e18ae8ff1a4a6fa432c64052d29e3f.png
[20200911115501876.png]: /images/20221123/4f938d83f48a4fd5bee4b0da1c387ad9.png
[20200913082232712.png]: /images/20221123/5ac52f7e83974706962f31aac60f71c0.png
[2020091308234065.png]: /images/20221123/1687630978b144568a4cc626d060125a.png
[20200913084655256.png]: /images/20221123/eaa66e87ee8c4bb4931d1f22a3138f04.png
[20200913085832467.png]: /images/20221123/781f14a17e56411da6fe5722e8b4a4ba.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NodXl1ZGV4aWFvd3U_size_16_color_FFFFFF_t_70 2]: /images/20221123/c2e8bc3d25724c1384067136e7cbf274.png