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class People(object):
    var1 = 1
    var2 = 2
    var3 = 3
    def __init__(self,name , age , weight):
        self.name = name
        self.age = age
        self.weight = weight

    def __lt__(self, other):
        print("compare.....")
        return self.age<other.age

    def __str__(self):
        return 'name:'+ self.name+'' + 'age:'+ str(self.age)+'' + 'weight:' + str(self.weight) + ''

    def test_fun(self):
        print("test unit")

zhang = People('zhang' , 23 , 64)

print(zhang.__dict__)
print(People.__dict__)

运行结果：

{'name': 'zhang', 'age': 23, 'weight': 64}

{'__module__': '__main__', 'var1': 1, 'var2': 2, 'var3': 3, '__init__': <function People.__init__ at 0x000002CC61951280>, '__lt__': <function People.__lt__ at 0x000002CC61951790>, '__str__': <function People.__str__ at 0x000002CC61951820>, 'test_fun': <function People.test_fun at 0x000002CC619518B0>, '__dict__': <attribute '__dict__' of 'People' objects>, '__weakref__': <attribute '__weakref__' of 'People' objects>, '__doc__': None}

 

在运行结果中可以看到实例的__dict__和对象的__dict__中包含不同的属性和方法，并以字典的形式进行存储的，其中属性名作为键，而值作为该键对应的值。

对象的__dict__是__init__()中包含的属性，不包含任何方法。

 

而类中的对象包含类属性，类函数，普通的方法等

 

一些内置的类型是没有__dict__属性的，比如int,list,dict等。

 

class People(object):
     var1 = 1
     var2 = 2
     var3 = 3
     def __init__(self,name , age , weight):
         self.name = name
         self.age = age
         self.weight = weight
 
     def __lt__(self, other):
         print("compare.....")
         return self.age<other.age
 
     def __str__(self):
         return 'name:'+ self.name+'' + 'age:'+ str(self.age)+'' + 'weight:' + str(self.weight) + ''
 
     def test_fun(self):
         print("test unit")
 
 class Student(People):
     def __init__(self,name , age , weight,score):
         super(Student, self).__init__(name , age , weight)
         self.score = score
     def print_score(self):
         print(self.name + ":" + str(self.score))
 
 
 zhang = People('zhang' , 23 , 64)
 print(zhang.__dict__)
 print(People.__dict__)
 
 zhao = Student('zhao' , 24,65 , 80)
 zhao.print_score()
 print(zhao.__dict__)
 print(Student.__dict__)

运行结果：

{'name': 'zhang', 'age': 23, 'weight': 64}

{'__module__': '__main__', 'var1': 1, 'var2': 2, 'var3': 3, '__init__': <function People.__init__ at 0x0000025C843D1280>, '__lt__': <function People.__lt__ at 0x0000025C843D1790>, '__str__': <function People.__str__ at 0x0000025C843D1820>, 'test_fun': <function People.test_fun at 0x0000025C843D18B0>, '__dict__': <attribute '__dict__' of 'People' objects>, '__weakref__': <attribute '__weakref__' of 'People' objects>, '__doc__': None}

 

{'name': 'zhao', 'age': 24, 'weight': 65, 'score': 80}

{'__module__': '__main__', '__init__': <function Student.__init__ at 0x0000025C843D1940>, 'print_score': <function Student.print_score at 0x0000025C843D19D0>, '__doc__': None}

子类和父类都有各自的__dict__。

可以对__dict__进行增删改查。

修改

zhao.__dict__.update(name="xiaozhao" , age="34",weight="66" , score=100)