Python 31st Day-----Class of encapsulation, inheritance, polymorphism .....

Packaging

The package is best understood. Encapsulation is one of the object-oriented features and is the main feature of object and class concepts.

Encapsulation, which is the encapsulation of objective things into abstract classes, and classes can put their own data and methods only trusted class or object operation, to the untrusted information hiding.

1 classDog (object):2nationality='CH'#Public Properties3     def __init__(Self,name,food,leven):#constructors, methods, initialization methods4Self.name=name#instance pointers, pointing to Property object Members5Self.food= Food6self.leven=Leven7Self.__haot='HHH'#Front double underline defined as private property8 9     defGet_hoat (self):#defines a method to provide an interface for a private propertyTen         returnSelf.__haot One     defSay (self):#methods in a class are public methods A         Print('hello,my name is', Self.name) -     defEat (self,foods): -         Print("My food is%s,but my eat%s"%(self.food,foods)) the     defleve (self): -         Print("my leve is", Self.leven) -  -     def __del__(self): +         Print("Delete in ...") -  +  AD=dog ("Liili",'GL',"5") at D.say () -D.eat ('KKK') - D.leve () - Print(D.get_hoat ())#Universal Interface access to private properties -  - Print(D._DOG__HAOT)#force access to private properties in Print(d.nationality) -  todog.nationality='Chan' + Print(d.nationality) -d.nationality='US' the Print(d.nationality)

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Inherited

Inheritance refers to the ability to use all the functionality of an existing class and to extend these capabilities without rewriting the original class.

New classes created through inheritance are called "subclasses" or "derived classes."

The inherited class is called the base class, the parent class, or the superclass.

1 classStuden (object):#Define class student base class2     def __init__(Self,name,age,clas):#name, age, Class3Self.name=name4Self.age= Age5self.clas=Clas6     defTalk (self):7         Print('%stalk one ... ..'%self.name)8     defWalk (self):9         Print('%s walk ....'%self.name)Ten     defInfo_user (self): One         Print('name is%s,%s,clas is%s'%(Self.name,self.age,self.clas)) A  - classClas_one (Studen):#Inherit Studen -     def __init__(Self,name,age,clas,score):#Refactoring Construction Method the         #studen.__init__ (Self,name,age,clas) #先继承, re-construct -Super (Clas_one,self).__init__(Name,age,clas)#New Class -Self.score=score#adding new Object Members -     defTalk (self):#overriding Method +         Print('is new talk,%s'%self.name) -     defScore_info (self):#new method of adding subclasses +         Print(Self.score,'points') A  atP=clas_one ('students a', 36,'Three shifts a year', 178) - P.talk () -P.score_info ()

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Polymorphic

1 classAnimal (object):2     def __init__(self,name):3Self.name=name4     defTalk (self):5         RaiseNotimplementederror ('Prompt Error')6 7 8 classC (Animal):#Inherit Animal9     defTalk (self):Ten         Print('%s 1111'%self.name) One  A classD (Animal):#Inherit Animal -     defTalk (self): -         Print('%s 2222'%self.name) the  -  - defTalk_all (obj):#using functions to simulate polymorphic - Obj.talk () +  -C1=c ('Cat') +D1=d ("Dog") A  at Talk_all (C1) -Talk_all (D1)

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Python 31st Day-----Class of encapsulation, inheritance, polymorphism .....