《Python编程：从入门到实践》答案

电玩女神 2022-12-05 15:15 360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

  1. class Restaruarant():
  2.     def __init__(self,restaurant_name,cuisine_type):
  3.         self.restaurant_name=restaurant_name
  4.         self.cuisine_type=cuisine_type
  5.     def describe_restaurant(self):
  6.         print("The cuisine_type is: "+self.cuisine_type)
  7.         print("The restaurant_name is: "+self.restaurant_name)
  8.     def open_restaurant(self):
  9.         print("We are in business.")
  10. R1=Restaruarant('客来','东北菜')
  11. print(R1.restaurant_name+" is good at "+R1.cuisine_type+".")
  13. R1.describe_restaurant()
  14. R1.open_restaurant()

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

  1. class Restaruarant():
  2.     def __init__(self,restaurant_name,cuisine_type):
  3.         self.restaurant_name=restaurant_name
  4.         self.cuisine_type=cuisine_type
  5.     def describe_restaurant(self):
  6.         print("The cuisine_type is: "+self.cuisine_type)
  7.         print("The restaurant_name is: "+self.restaurant_name)
  8.     def open_restaurant(self):
  9.         print("We are in business.")
  10. R1=Restaruarant('客来','东北菜')
  11. print(R1.restaurant_name+" is good at "+R1.cuisine_type+".")
  13. R1.describe_restaurant()
  14. R1.open_restaurant()
  16. print("\n")
  17. R2=Restaruarant('红旗','东北菜')
  18. R3=Restaruarant('山西','刀削面')
  19. R4=Restaruarant('西北','兰州拉面')
  22. R2.describe_restaurant()
  23. R2.open_restaurant()
  25. R3.describe_restaurant()
  26. R3.open_restaurant()
  28. R4.describe_restaurant()
  29. R4.open_restaurant()

20200911085513586.png

  1. class User():
  2.     def __init__(self,first_name,last_name,age):
  3.         self.first_name=first_name
  4.         self.last_name=last_name
  5.         self.age=age
  6.     def describe_user(self):
  7.         print("first name is "+self.first_name)
  8.         print("last name is "+self.last_name)
  9.         print("age is "+str(self.age))
  10.     def greet_user(self):
  11.         full_name=self.first_name+" "+self.last_name
  12.         print("Welcome you ,"+full_name+" ,have a nice day .")
  14. user1=User('张','宸宸',23)
  15. user1.greet_user()
  16. user1.describe_user()
  18. user2=User('王','舍',24)
  19. user2.greet_user()
  20. user2.describe_user()
  22. user3=User('肖','大在',83)
  23. user3.greet_user()
  24. user3.describe_user()

【注意】每个属性前面都是要加self.的。

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  1. class Restaruarant():
  2.     def __init__(self,restaurant_name,cuisine_type):
  3.         self.restaurant_name=restaurant_name
  4.         self.cuisine_type=cuisine_type
  5.         self.number_served=0
  6.     def describe_restaurant(self):
  7.         print("The cuisine_type is: "+self.cuisine_type)
  8.         print("The restaurant_name is: "+self.restaurant_name)
  9.     def open_restaurant(self):
  10.         print("We are in business.")
  11.     def set_number_served(self,num):
  12.         self.number_served=num
  13.     def increment_number_served(self,num):
  14.         self.number_served+=num
  17. R1=Restaruarant('客来','东北菜')
  18. print(R1.restaurant_name+" is good at "+R1.cuisine_type+
  19.         "and "+str(R1.number_served)+" people have been came here.")
  20. R1.set_number_served(3000)
  21. print(R1.restaurant_name+" is good at "+R1.cuisine_type+
  22.         "and "+str(R1.number_served)+" people have been came here.")
  24. R1.increment_number_served(30)
  25. print(R1.restaurant_name+" is good at "+R1.cuisine_type+
  26.         "and "+str(R1.number_served)+" people have been came here.")

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  1. class User():
  2.     def __init__(self,first_name,last_name,age):
  3.         self.first_name=first_name
  4.         self.last_name=last_name
  5.         self.age=age
  6.         self.login_attempts=0
  7.     def increment_login_attempts(self):
  8.         self.login_attempts+=1
  9.     def reset_login_attempts(self):
  10.         self.login_attempts=0
  12.     def describe_user(self):
  13.         print("first name is "+self.first_name)
  14.         print("last name is "+self.last_name)
  15.         print("age is "+str(self.age))
  16.     def greet_user(self):
  17.         full_name=self.first_name+" "+self.last_name
  18.         print("Welcome you ,"+full_name+" ,have a nice day .")
  20. user1=User('张','宸宸',23)
  21. print(user1.login_attempts)
  22. user1.increment_login_attempts();
  23. user1.increment_login_attempts();
  24. user1.increment_login_attempts();
  25. user1.increment_login_attempts();
  26. print(user1.login_attempts)
  27. user1.reset_login_attempts();
  28. print(user1.login_attempts)

2020091111121961.png

  1. class Restaruarant():
  2.     def __init__(self,restaurant_name,cuisine_type):
  3.         self.restaurant_name=restaurant_name
  4.         self.cuisine_type=cuisine_type
  5.         self.number_served=0
  6.     def describe_restaurant(self):
  7.         print("The cuisine_type is: "+self.cuisine_type)
  8.         print("The restaurant_name is: "+self.restaurant_name)
  9.     def open_restaurant(self):
  10.         print("We are in business.")
  11.     def set_number_served(self,num):
  12.         self.number_served=num
  13.     def increment_number_served(self,num):
  14.         self.number_served+=num
  16. class IceCreamStand(Restaruarant):
  17.     def __init__(self,restaurant_name,cuisine_type):
  18.         super().__init__(restaurant_name,cuisine_type)
  19.         self.flavors=['strawberry','berry','grape','banana']
  20.     def show_Ice(self):
  21.         for key in self.flavors:
  22.             print(key)
  24. My_Ice=IceCreamStand('客来','东北菜')
  25. My_Ice.show_Ice()

20200911112317627.png

  1. class User():
  2.     def __init__(self,first_name,last_name,age):
  3.         self.first_name=first_name
  4.         self.last_name=last_name
  5.         self.age=age
  6.         self.login_attempts=0
  7.     def increment_login_attempts(self):
  8.         self.login_attempts+=1
  9.     def reset_login_attempts(self):
  10.         self.login_attempts=0
  12.     def describe_user(self):
  13.         print("first name is "+self.first_name)
  14.         print("last name is "+self.last_name)
  15.         print("age is "+str(self.age))
  16.     def greet_user(self):
  17.         full_name=self.first_name+" "+self.last_name
  18.         print("Welcome you ,"+full_name+" ,have a nice day .")
  20. class Admin(User):
  21.     def __init__(self,first_name,last_name,age):
  22.         super().__init__(first_name,last_name,age)
  23.         self.privileges=["can ban user",'can delete post','can add post']
  24.     def show_privileges(self):
  25.         for key in self.privileges:
  26.             print(key)
  28. Admin1=Admin('张','宸宸',23)
  29. Admin1.show_privileges()

【注意】super().__init__()的写法。、

20200911114353137.png

  1. class Privileges():
  2.     def __init__(self):
  3.         self.privileges=["can ban user",'can delete post','can add post']
  5.     def show_privileges(self):
  6.         for key in self.privileges:
  7.             print(key)
  10. class User():
  11.     def __init__(self,first_name,last_name,age):
  12.         self.first_name=first_name
  13.         self.last_name=last_name
  14.         self.age=age
  15.         self.login_attempts=0
  16.     def increment_login_attempts(self):
  17.         self.login_attempts+=1
  18.     def reset_login_attempts(self):
  19.         self.login_attempts=0
  21.     def describe_user(self):
  22.         print("first name is "+self.first_name)
  23.         print("last name is "+self.last_name)
  24.         print("age is "+str(self.age))
  25.     def greet_user(self):
  26.         full_name=self.first_name+" "+self.last_name
  27.         print("Welcome you ,"+full_name+" ,have a nice day .")
  29. class Admin(User):
  30.     def __init__(self,first_name,last_name,age):
  31.         super().__init__(first_name,last_name,age)
  32.         self.privileges=Privileges()
  35. Admin1=Admin('张','宸宸',23)
  36. 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

  1. class Car():
  2.     def __init__(self,made,model,year):
  3.         self.made=made
  4.         self.model=model
  5.         self.year=year
  7.     def descriptive_name(self):
  8.         long_name=str(self.year)+' '+self.made+' '+self.model
  9.         return long_name.title()
  11. class Battery():
  12.     def __init__(self,battery=70):
  13.         self.battery=battery
  15.     def describe_battery(self):
  16.         print("This car has a "+str(self.battery)+"-kwh battery")
  17.     def get_range(self):
  18.         if self.battery==70:
  19.             range=240
  20.         elif self.battery==85:
  21.             range=270
  22.         message="This car can go "+str(range)
  23.         message+=" miles on a full charge."
  24.         print(message)
  25.     def update_battery(self):
  26.         if self.battery!=85:
  27.             self.battery=85
  29. class EleCar(Car):
  30.     def __init__(self,made,model,year):
  31.         super().__init__(made,model,year)
  32.         self.battery=Battery()
  34. new_eleCar=EleCar("Audi","s450",4)
  35. new_eleCar.battery.get_range()
  36. new_eleCar.battery.update_battery()
  37. new_eleCar.battery.get_range()

20200913082232712.png

  1. #Restaurant.py
  2. class Restaurant():
  3.     def __init__(self,name,make,model,year):
  4.         self.name=name
  5.         self.make=make
  6.         self.model=model
  7.         self.year=year
  9.     def show_detils(self):
  10.         print(str(self.year)+" , "+self.name+" , "+self.model+" , "+self.make)
  12. from Restaurant import Restaurant
  13. my_class=Restaurant('Benz','China','s-450','2016')
  14. my_class.show_detils()

2020091308234065.png

  1. #模块
  2. class Privileges():
  3.     def __init__(self):
  4.         self.privileges=["can ban user",'can delete post','can add post']
  6.     def show_privileges(self):
  7.         for key in self.privileges:
  8.             print(key)
  11. class User():
  12.     def __init__(self,first_name,last_name,age):
  13.         self.first_name=first_name
  14.         self.last_name=last_name
  15.         self.age=age
  16.         self.login_attempts=0
  17.     def increment_login_attempts(self):
  18.         self.login_attempts+=1
  19.     def reset_login_attempts(self):
  20.         self.login_attempts=0
  22.     def describe_user(self):
  23.         print("first name is "+self.first_name)
  24.         print("last name is "+self.last_name)
  25.         print("age is "+str(self.age))
  26.     def greet_user(self):
  27.         full_name=self.first_name+" "+self.last_name
  28.         print("Welcome you ,"+full_name+" ,have a nice day .")
  30. class Admin(User):
  31.     def __init__(self,first_name,last_name,age):
  32.         super().__init__(first_name,last_name,age)
  33.         self.privileges=Privileges()
  35. from ex911 import User,Privileges,Admin 
  36. Admin1=Admin('张','宸宸',23)
  37. Admin1.privileges.show_privileges()

20200913084655256.png

  1. from ex913 import User
  2. class Privileges():
  3.     def __init__(self):
  4.         self.privileges=["can ban user",'can delete post','can add post']
  6.     def show_privileges(self):
  7.         for key in self.privileges:
  8.             print(key)
  11. class Admin(User):
  12.     def __init__(self,first_name,last_name,age):
  13.         super().__init__(first_name,last_name,age)
  14.         self.privileges=Privileges()
  16. class User():
  17.     def __init__(self,first_name,last_name,age):
  18.         self.first_name=first_name
  19.         self.last_name=last_name
  20.         self.age=age
  21.         self.login_attempts=0
  22.     def increment_login_attempts(self):
  23.         self.login_attempts+=1
  24.     def reset_login_attempts(self):
  25.         self.login_attempts=0
  27.     def describe_user(self):
  28.         print("first name is "+self.first_name)
  29.         print("last name is "+self.last_name)
  30.         print("age is "+str(self.age))
  31.     def greet_user(self):
  32.         full_name=self.first_name+" "+self.last_name
  33.         print("Welcome you ,"+full_name+" ,have a nice day .")
  35. from ex911 import Privileges,Admin 
  36. from ex913 import User
  37. Admin1=Admin('张','宸宸',23)
  38. Admin1.privileges.show_privileges()

20200913085832467.png

  1. from collections import OrderedDict
  2. #创建三个同学，把他们放在一个班级里,遍历出所有同学，
  3. #错误1 把班级写成了class，整成了Python中的关键字。
  4. #错误2 内部的字典最后一个键值对后面也是有逗号的。
  5. #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。
  8. classes = OrderedDict()
  9. classes['s1']={
  10.         'name':'Zhang',
  11.         'num':'001',
  12.         'age':'18',
  13.         'good at ':'math',
  14.     }
  15. classes['s2']={
  16.         'name':'Wang',
  17.         'num':'002',
  18.         'age':'16',
  19.         'good at ':'Chinese',
  20.     }
  21. classes['s3']={
  22.         'na3e':'Li',
  23.         'num':'003',
  24.         'age':'17',
  25.         'good at ':'Python',
  26.     }
  29. for name,info in classes.items():
  30.     print('\nStudent name is : '+name)
  31.     print('\tStudent number is : '+info['num'])
  32.     print('\tStudent age is : '+info['age'])
  33.     print('\tStudent goot at is : '+info['good at '])

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  1. from random import randint
  3. class Die():
  4.     def __init__(self):
  5.         self.sides=6
  6.     def show_die(self):
  7.         self.sides=randint(1,6)
  8.         print(self.sides)
  10. ex=Die()
  11. for i in range(1,11):
  12.     ex.show_die()
  14. class Die2():
  15.     def __init__(self):
  16.         self.sides=6
  17.     def show_die(self):
  18.         self.sides=randint(1,11)
  19.         print(self.sides)
  21. ex2=Die2()
  22. for i in range(1,11):
  23.     ex2.show_die()

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