day20作业

1 1 1
1 2 1
3 2 3

• 从父类继承，自己没有的就可以到父类中找
• 私有的都是不可以访问的，但是本质上依然是改了名称放在这个属性所在类的_dict-中
• 继承时，公有的，子类和实例都可以随意访问，私有成员被隐藏了，子类和实例不可直接访问
• 当私有变量所在的类内的方法中可以访问这个私有变量
• 属性查找属性：实例的dict--》类的dict--》父类dict

G-D-A-B-F-C-B-D-A

先从G开始运行，第一个是G ，G中继承的父类是D和B，其中D中继承的父类是A，所以G-D-A-B,

然后从F运行，第一个是F，F中继承的父类是C,B,D，广度优先，最后是A

新式类

• 继承了object的类以及该类的子类，都是新式类
• Python3中所有的类都是新式类

经典类

• 没有继承object的类以及该类的子类，都是经典类
• 只有Python2中才有经典类

深度优先遍历不断深入图中并在栈中保存了所有分叉的顶点；广度优先遍历则像扇面一般扫描图，用一个队列保存访问过的最前端的顶点。深度遍历的方式是寻找离起点更远的顶点，只在碰到死胡同时才访问进出的顶点，广度遍历则会首先覆盖起点附近的顶点，只在临近的顶点都被访问完后，才去访问更远的顶点。

import pickle
import hashlib
import time
class Teacher:
    def __init__(self, name, sex, age, level, salary):
        self.name = name
        self.age = age
        self.sex = sex
        self.level = level
        self.salary = salary
    def create_id(self):
        now = time.strftime('%Y-%m-%d---%X')
        info = self.name + self.sex + str(self.age) + str(self.level) + str(self.salary)
        res = hashlib.md5((now + info).encode('utf-8'))
        self.id = res.hexdigest()
        return self.id
    def tell_info(self):
        print((' Info of %s ' % (self.name)).center(50, '-'))
        print('''
    编号: %s
    姓名: %s
    性别: %s
    年龄: %s
    等级: %s
    薪资: %s
        ''' % (
            self.id, self.name, self.sex, 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'))
t1 = Teacher('haonan', 'male', 18, 1, 1)
t1.create_id()
t1.tell_info()
t1.save()
res = t1.get_obj_by_id()
print(res)

class Student:
    def __init__(self, name, sex, age):
        self.name = name
        self.age = age
        self.sex = sex

    def create_id(self):
        now = time.strftime('%Y-%m-%d---%X')
        info = self.name + self.sex + str(self.age)
        res = hashlib.md5((now + info).encode('utf-8'))
        self.id = res.hexdigest()
        return self.id

    def tell_info(self):
        print((' Info of %s ' % (self.name)).center(50, '-'))
        print('''
    编号: %s
    姓名: %s
    性别: %s
    年龄: %s
        ''' % (
            self.id, self.name, self.sex, 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'))

t2 = Student('wanghaonan', 'male', 18)
t2.create_id()
t2.tell_info()
t2.save()
res = t2.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('haonan', 'male', 18, 1, 1000)
s1 = Students('wanghaonan', 'male', 18)
t1.create_id()
t1.tell_info()
t1.save()
t1.get_obj_by_id()
print(t1.get_obj_by_id())