Python 36th Day-----Special member method in class

__doc__ View the description of the tip

__MODULE__ represents the module where the object of the current operation is located

__CLASS__ represents the class to which the object of the current operation belongs

__init__ construction method automatically executes objects by class

__del__ destructor, the current object is freed in memory automatic chopper execution

The __call__ object is appended with parentheses to trigger execution

__dict__ viewing members in a class or object

__str__ If this method is defined in a class, output the return value of this method when printing such an object

__GETITEM__ when a property member of a dictionary is defined in a class, you can get

__setitem__ setting the data for a dictionary in a class

__DELITEM__ deleting data from a dictionary in a class

__metalass__ is used to indicate who created the class by whom it was instantiated.

__new__ triggering __init__ Creating an instance

1 #! Usr/bin/env python2 #-*-coding:utf-8-*-3 #Author Calmyan4 5  fromLib.ssImporta6 #Example Class Dog7 classDoges (object):8     """description information for the class"""9     def __init__(Self,name,food):TenSelf.name=name OneSelf.food= Food Aself.data={}#define a dictionary of a class -     def __call__(Self, *args, **kwargs):#execution of parentheses after the object -         Print(*args) the     def __str__(self):#default output return value -         returnSelf.name -     def __getitem__(self):#can get the dictionary of the class -         returnSelf.data +     def __setitem__(Self, key, value):#A dictionary of classes can be set -self.data[key]=value +     def __delitem__(Self, key):#You can delete the contents of a Dictionary of classes A         delSelf.data[key] atDog=doges ('XXX','III') - Print(dog.)__doc__) -b=A () - Print(b.__module__)#The module that operates the object - Print(dog.)__class__)#what is the class of the object currently being manipulated -Dog'111')# in Print(Doges.__dict__)#View a member of a class or object class only prints members of the class that do not print objects - Print(dog.)__dict__)#View members of a class or object only the members of the Print object do not print members of the class to Print(dog)#Print the return value of the __str__ + Print(dog.)__str__())#Print return value -  thedog['1']=1000#trigger. __setitem__ () *dog['2']=1000#trigger. __setitem__ () $ Print(dog.)__getitem__())Panax Notoginseng Print(dog.)__delitem__('1'))#Delete a dictionary in a class - Print(dog.)__getitem__()) the  + #special methods for setting classes A deffunc (self): the     Print('Hello word%s'%self.name) +     Print() -  $ def __init__(self,name,age): $Self.name=name -Self.age= Age - ##type参数 1: Class Name 2. class's base Class 3. Member of class, dictionary format theCat=type ('CAT', (object,), {'func': Func,'__init__':__init__}) - WuyiCat=cat ('Meow Meow', 3) the Cat.func () - Print(Cat.name,cat.age)

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Reflection: Calling a method in an object through a string

1 #! Usr/bin/env python2 #-*-coding:utf-8-*-3 #Author Calmyan4 #Reflection5 6 #define a new method7 defBulk (self):8     Print("%s is talking ...."%self.name)9 Ten classDOG (object): One     def __init__(self,name): ASelf.name=name -     defEat (Self,food): -         Print('%s is eating%s'%(Self.name,food)) the  -D=dog ('a dog') -  -Stres=input ('Method:'). Strip ()#Manual Input Method +  - ifHasattr (d,stres):#reflects the method in the object through a string, whether there is +Func=getattr (D,stres)#Call this method AFunc"Bones")#Execution Method at Else: -SetAttr (D,stres,bulk)#object adds a method to return a memory address -GetAttr (D,stres) (d)#call this method to increase the -     #D.talk (d) - #Property Modification -Stres1=input ('Properties:'). Strip ()#Entering properties manually in ifHasattr (d,stres1):#if it already exists -Attr=getattr (D,STRES1)#called toA=input ('re-assign value:'). Strip () + setattr (d,stres1,a) -     Print(GetAttr (d,stres1)) the Else: *A=input ('newly assigned value:'). Strip () $SetAttr (D,stres1,a)#object adds a property that assigns the value of this propertyPanax Notoginseng     Print(stres1) -     Print(GetAttr (d,stres1)) the  + Print(d.__dict__) ADela=input ('To delete a property:'). Strip () the  + ifHasattr (D,dela):#if it already exists -Delattr (D,dela)#to delete $     Print('Delete succeeded') $  - Print(d.__dict__)

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Python 36th Day-----Special member method in class