Python classes and objects-extensions

1. Dynamically creating properties or methods for a class or object

2, __slots__ = (' name ', ' age '), "instance" can only create a specified property property or method---modern class

3. Different constructors for executing the parent class
Father.__init__ (self)--classic class
Super (Son,self). __init__ ()--New class

4. PERSON.__BASES__ displays only one layer of inherited all parent classes
5, __call__
__call__ an already instantiated object P, in the call P ()
6. Everything in Python is an object, and the class itself is an object, and the class is generated by type.

Class Foo
Pass
Bar = Type (' Bar ', (object,), {' name ': 123, ' Func ': Hello})

The above equals

class Bar:     ' YANGMV '    def func (self):         Print ' go func '  = Bar (). Func ()

In this case, for a defined class, once a class is defined, the constructor of the type class is called once, and how is it validated?

7. __metaclass__ can specify that the class is generated by that type

class metaclass (type):     def __init__ (self,name,bases,dicts):         Print name      class C1:     __metaclass__ = metaclass     class  C2:    __metaclass__ = Metaclass

8, __init__ __new__ __call__
We know that executing F = Foo () will execute the constructor by default __init__
Actually executed: type (' foo ', bases,dicts). __call__ (' foo ')

classmetaclass (type):def __init__(self,name,bases,dicts):Printnamedef __call__(Self, *args, * *Kwargs):PrintSelf result= self.__new__(Self, *args, * *Kwargs)Printresult type (result).__init__(result,*args,**Kwargs)returnresultclassC1:__metaclass__=Metaclassdef __init__(self):Print 'c1.__init__'Self.name=' YANGMV'             def __new__(CLS, *args, * *Kwargs):PrintCLSPrintargsPrintKwargsreturnObject.__new__(CLS, *args, * *Kwargs)defHello (self):Print 'Hello'classC2:__metaclass__=Metaclass#C = C1 ()C1 = object.__new__(C1) C1. Hello ()

Python classes and objects-extensions