###Special member methods of classes

###Special member methods of 
classes #__call__ Objects are followed by parentheses to trigger execution. 
##Note: The execution of the constructor is triggered by the creation of the object, that is: object = class name (): and the execution of the __call__ method is triggered by the parentheses after the object, that is: object () or class () （）
class Dog ( object) : def __init__( self, name, addr) : self.name = name self.addr = addr def blak( self) : print( "%s has a nice voice..." % self .name) def __call__( self, *args, **kwargs) : print( args, kwargs) def __str__( self) : return "<obj:%s>" %
 
 
 
 
 
 
 
 
 self.name 


dl = Dog( "Caicai", "22") 
dl( 1, 2, 3, 4, name = "Caicai") 

###__dict__ View all members in a class or object 
print(Dog. __dict__) ###View all object methods in a class 
##Output: {'__module__': '__main__', '__init__': <function Dog.__init__ at 0x057F6C90>, 'blak': <function Dog.blak at 0x057F6C48>, ' __call__': <function Dog.__call__ at 0x057F6C00>, '__dict__': <attribute '__dict__' of 'Dog' objects>, '__weakref__': <attribute '__weakref__' of 'Dog' objects>, '__doc__': None} 
print(dl.__dict__) ##Get the members of the current object 
##Output: {'name': 'Caicai', 'addr': '22'} 


###__str__If a class defines the __str__ method, then print the object When , the return value of the method is output by default.
print(dl) 
##Output: <obj:Caicai> 

###__getitem__/__setitem__/__delitem__ 
###For indexing operations/like dictionaries. The above means to get, set and delete data 
class Foo ( object) : def __getitem__( self, key) : print( "__getitem__", key) def __setitem__( self, key, value) : print( "__setitem__", key, value) def __delitem__( self, key) : print( "__delitem__", key) obi = Foo()