class People:
 def __init__(self,name,age,salary):
  self.name=name
  self.age=age
  self.__salary=salary
p=People('zhang',19,100000)
print(p.name)#zhang
print(p.age)#19
print(p.__salary)#AttributeError: 'People' object has no attribute '__salary'

print(p.__dict__)#{'name': 'zhang', 'age': 19, '_People__salary': 100000}

print(p._People__salary)#100000

class A:
 def foo(self):
  print('from A foo')
  self.bar()
 def bar(self):
  print('from A bar')
class B(A):
 def bar(self):
  print('from B bar')
b=B()
b.foo() 　#from A foo
　　　　　　#from B bar 别想多了，调用函数时别看定义位置，要看调用位置

class A:
 def foo(self):
  print('from A foo')
  self.__bar()
 def __bar(self):
  print('from A bar')
class B(A):
 def __bar(self):
  print('from B bar')
b=B()
b.foo() #from A foo
  #from A bar　　有没有感受到编程的美妙

class People:
 def __init__(self,name,age,height,weight,hobby):
  self.__name=name
  self.__age=age
  self.__height=height
  self.__weight=weight
  self._hobby=hobby
 def tell_info(self):
  print('''
  name:%s
  age:%s
  height:%s
  weeight:%s
  '''%(self.__name,self.__age,
    self.__height,self.__weight))
p=People('zhang',18,1.90,75,'read')
p.tell_info()

 def tell_name(self):
  print(self.__name)
 #修改名字
 def set_name(self,new):
  if not isinstance(new,str):
   raise TypeError('名字必须是字符串类型')
  self.__name=new

class People:
 def __init__(self,name,age,height,weight,hobby):
  self.__name=name
  self.__age=age
  self.__height=height
  self.__weight=weight
  self._hobby=hobby
 @property
 def name(self):
  return self.__name
p=People('zhang',18,1.90,75,'read')
print(p.name)#zhang

 @property
 def name(self):
  return self.__name
 #name已经被property修饰过，就有setter和deleter
 @name.setter
 def name(self,new):
  if not isinstance(new,str):
   raise TypeError('名字必须是字符串类型')
  self.__name=new
 @name.deleter
 def name(self):
  del self.__name
p = People('zhang', 18, 1.90, 75, 'read')
print(p.name)#zhang
p.name='can' #修改
print(p.name)#can
del p.name #删除
print(p.name)#AttributeError: 'People' object has no attribute '_People__name'

class People:
 def __init__(self,name):
  self.name=name
 def bar(self):
  print('----->',self.name)
 @classmethod
 def func(cls):
  print(cls)
p1=People('zhang')
p1.func() #<class '__main__.People'>
People.func()#<class '__main__.People'>

#文件名：pickle_test
import hashlib
import time
import pickle
import os
student_path=r'C:UsersAdministratorPycharmProjectsteststudent'
class People:
 def __init__(self,name,sex,user_id):
  self.name=name
  self.sex=sex
  self.user_id=user_id
  self.id = self.create_id()
 def tell_info(self):
  print('''
  --------%s info--------
  id:%s
  name:%s
  sex:%s
  user_id:%s
  ''' %(self.name,self.id,self.name,self.sex,self.user_id))
 def create_id(self):
  m=hashlib.md5()
  m.update(self.name.encode('utf-8'))
  m.update(self.sex.encode('utf-8'))
  m.update(str(self.user_id).encode('utf-8'))
  return m.hexdigest()
 def save(self):
  with open(self.id,'wb') as f:
   pickle.dump(self,f)
 @staticmethod #非绑定方法，就是一个函数，就是一个工具而已，不需要类，也不需对象
 def get_all():
  res = os.listdir(student_path)
  for item in res:
   file_path=r'%s%s' %(student_path,item)
   with open(file_path,'rb') as f:
    obj=pickle.load(f)
    obj.tell_info()
#反序列化.py
from pickle_test import People
p=People('zhang','male',123123123)
p.get_all()