day 20 作业

作业

1. 1 1 1

   1 2 1

   3 2 3

   查找顺序:子类--->父类

2. G D A B

   F C B D A

   非菱形继承

   

   菱形继承

   

3. 新式类

   继承了object的类及其子类,都是新式类

   经典类

   没有继承object的类及其子类,都是经典类

   区别:

   新式类继承了object类,python3中所有的类都是新式类,只有python2中才有经典类

   深度优先:

   直接先去找多个类最后继承的类,也就是object的子类

   广度优先:

   不找多个类最后继承的同一个类，直接去找下一个父类

4. import hashlib
   import datetime
   import pickle
   
   
   class People:
       def __init__(self, name, gender, age):
           self.name = name
           self.gender = gender
           self.age = age
   
       def save(self):
           with open(f'{self.creat_id()}.pkl', 'wb') as f:
               pickle.dump(self, f)
   
       def get_obj_by_id(self, tea_id):
           return pickle.load(open(f'{tea_id}.pkl', 'rb'))
   
   
   class Teacher(People):
       def __init__(self, name, gender, age, level, salary):
           super().__init__(name, gender, age)
           self.level = level
           self.salary = salary
   
       def tell_info(self):
           tea_id = self.creat_id()
           print(f'id:{tea_id}, name:{self.name}, gender:{self.gender}, age:{self.age}, level:{self.level}, salary:{self.salary}')
   
       def creat_id(self):
           m = hashlib.md5()
           m.update(str(datetime.datetime.today()).encode('utf8'))
           m.update(self.name.encode('utf8'))
           m.update(self.gender.encode('utf8'))
           m.update(str(self.age).encode('utf8'))
           m.update(self.level.encode('utf8'))
           m.update(str(self.salary).encode('utf8'))
           tea_id = m.hexdigest()
           return tea_id
   
   
   class Student(People):
       def tell_info(self):
           tea_id = self.creat_id()
           print(f'id:{tea_id}, name:{self.name}, gender:{self.gender}, age:{self.age}')
   
       def creat_id(self):
           m = hashlib.md5()
           m.update(str(datetime.datetime.today()).encode('utf8'))
           m.update(self.name.encode('utf8'))
           m.update(self.gender.encode('utf8'))
           m.update(str(self.age).encode('utf8'))
           tea_id = m.hexdigest()
           return tea_id
   
   
   tea1 = Teacher('tiny', 'male', 18, 'S', 20000)
   tea1.tell_info()
   # tea1.save()
   res = tea1.get_obj_by_id('ad415940992f716a042bcebfa11336f0')
   print(res)
   
   stu1 = Student('nick', 'male', 20)
   stu1.tell_info()
   # stu1.save()
   print(stu1.get_obj_by_id('aa6ac4009a17e1a415cbf5fbad7a3ab6'))