gary's mod

第一题：

class Parent(object):
    x = 1
class Child1(Parent):
    pass
class Child2(Parent):
    pass
print(Parent.x, Child1.x, Child2.x)#由于前面只有在父类定义一个x，因此全部输出的都是1 #1 1 1
Child1.x = 2
print(Parent.x, Child1.x, Child2.x)#子类会优先从自己这边查找，因此child1输出的2 #1 2 1
Parent.x = 3
print(Parent.x, Child1.x, Child2.x)#当子类未被定义的时候，会去父类查找，因此child2输出的是3# 3 2 3

第二题：

[图片]

第三题

新式类：继承了object类以及该类的子类就是新式类了，而且python3中所有的都是新式类

经典类：相对的没有继承object类以及该类的子类就是经典类，只有再python2中有经典类

import hashlib
import time
import pickle
class teacher :
    def __init__(self,name,gender,age,level,salary):
        self.name=name
        self.gender=gender
        self.age=age
        self.level=level
        self.salary=salary
    def create_id(self):
        tempral=time.strftime('%Y/%M/%D---%X')
        info=self.name+self.gender+str(self.age)+str(self.level)+str(self.salary)
        res = hashlib.md5((tempral + info).encode('utf-8'))
        self.id=res.hexdigest()
        return self.id
    def tell_info(self):
        print('''
编号: %s
姓名: %s
性别: %s
年龄: %s
等级: %s
薪资: %s
    ''' % (
            self.id, self.name, self.gender, self.age, self.level, self.salary))
    def save(self):
        with open(self.id, 'wb') as f:
            pickle.dump(self, f)
    def get_obj_by_id(self):
        return pickle.load(open(self.id,'rb'))
tea=teacher('Gary','male',20,5,10)
tea.create_id()
tea.tell_info()
tea.save()
res=tea.get_obj_by_id()
print(res)
class student:
    def __init__(self, name, gender, age):
        self.name = name
        self.age = age
        self.gender = gender
    def create_id(self):
        tempral = time.strftime('%Y/%M/%D---%X')
        info=self.name+self.gender+str(self.age)
        res = hashlib.md5((tempral + info).encode('utf-8'))
        self.id=res.hexdigest()
        return self.id
    def tell_info(self):
        print('''
编号: %s
姓名: %s
性别: %s
年龄: %s
    ''' % (
            self.id, self.name, self.gender, self.age))
    def save(self):
        with open(self.id, 'wb') as f:
            pickle.dump(self, f)
    def get_obj_by_id(self):
        return pickle.load(open(self.id, 'rb'))
tea=student('Gary','male',20)
tea.create_id()
tea.tell_info()
tea.save()
res=tea.get_obj_by_id()
print(res)

import hashlib
import time
import pickle
class teacher :
    def __init__(self,name,gender,age,level,salary):
        self.name=name
        self.gender=gender
        self.age=age
        self.level=level
        self.salary=salary
    def create_id(self):
        tempral=time.strftime('%Y/%M/%D---%X')
        info=self.name+self.gender+str(self.age)+str(self.level)+str(self.salary)
        res = hashlib.md5((tempral + info).encode('utf-8'))
        self.id=res.hexdigest()
        return self.id
    def tell_info(self):
        print('''
编号: %s
姓名: %s
性别: %s
年龄: %s
等级: %s
薪资: %s
    ''' % (
            self.id, self.name, self.gender, self.age, self.level, self.salary))
    def save(self):
        with open(self.id, 'wb') as f:
            pickle.dump(self, f)
    def get_obj_by_id(self):
        return pickle.load(open(self.id,'rb'))
tea=teacher('Gary','male',20,5,10)
tea.create_id()
tea.tell_info()
tea.save()
res=tea.get_obj_by_id()
print(res)
class student:
    def __init__(self, name, gender, age):
        self.name = name
        self.age = age
        self.gender = gender
    def create_id(self):
        tempral = time.strftime('%Y/%M/%D---%X')
        info=self.name+self.gender+str(self.age)
        res = hashlib.md5((tempral + info).encode('utf-8'))
        self.id=res.hexdigest()
        return self.id
    def tell_info(self):
        print('''
编号: %s
姓名: %s
性别: %s
年龄: %s
    ''' % (
            self.id, self.name, self.gender, self.age))
    def save(self):
        with open(self.id, 'wb') as f:
            pickle.dump(self, f)
    def get_obj_by_id(self):
        return pickle.load(open(self.id, 'rb'))
tea=student('Gary','male',20)
tea.create_id()
tea.tell_info()
tea.save()
res=tea.get_obj_by_id()
print(res)
import hashlib
import time
import pickle
class People:
    def __init__(self, name, gender, age):
        self.name = name
        self.gender = gender
        self.age = age
    def create_id(self):
        m = hashlib.md5()
        t = str(time.time())
        s = str(self.__dict__)
        m.update(t.encode('utf-8'))
        m.update(s.encode('utf-8'))
        t1.num = m.hexdigest()
    def tell_info(self):
        print(self.__dict__) 
    def save(self):
        with open(t1.num, 'wb') as f:
            pickle.dump(self.__dict__, f)
    def get_obj_by_id(self):
        return pickle.load(open(self.num, 'rb'))
class Teacher(People):
    def __init__(self, name, gender, age, level, salary):
        People.__init__(self, name, gender, age)
        self.level = level
        self.salary = salary
class Students(People):
    def __init__(self, name, gender, age):
        People.__init__(self, name, gender, age)
t1 = Teacher('gary', 'male', 18, 1, 1000)
s1 = Students('gary', 'male', 18)
t1.create_id()
t1.tell_info()
t1.save()
t1.get_obj_by_id()
print(t1.get_obj_by_id())