Python\ class

1 Initial class

1 declaring a class (similar to declaring a function)

The definition format of the class

Class Name:

' class's document string '

Class Body

2 Create a class:

Class Data:

Pass

Idioms used in Python programming use singular words and capitalize the first letter of the class name

A class is a combination of data and a function, which is called a property of a class

Class Garen: #定义英雄盖伦的类, different players can use it to instantiate their own heroes;

The camp of camp= ' Demacia ' #所有玩家的英雄 (Galen) is Demacia;

Def attack (Self,enemy): #普通攻击技能, Enemy is the enemy;

Enemy.life_value-=self.aggressivity #根据自己的攻击力, attack the enemy and lose the enemy's health.

Role of Class 2 1: Attribute reference

Property reference (class name. Properties)

(1) The Data property (class name) of the reference class. Variable name

Print (Garen.camp) # Reference class's Data property, which is shared with all objects/instances

The output is:

Demacia

(2) The function attribute (class name) of the reference class.

Print (Garen.attack) #引用类的函数属性, this property also shares

The output is:

<function Garen.attack at 0x00000059ce8faf28>

(3) Property manipulation of classes

Garen.name= ' Garen1 ' #增加属性

Print (Garen.name) #查询属性

The output is:

Garen1

Del Garen.name #删除属性

Print (Garen.name)

The output is:

Attributeerror:type object ' Garen ' has no attribute ' name ' #报错

garen.camp= "AAAA" #修改属性

Print (Garen.camp)

The output is:

Aaaa

Role of Class 3 2: Instantiation (1) __init__ instantiation

The class name parentheses are instantiated, which automatically triggers the operation of the __INIT__ function, which can be used to customize each instance's own features.

Class Garen:

camp= ' Demacia '

def __init__ (self,nickname,aggressivity=58,life_value=455):

Self.nickname=nickname #为自己的盖伦起个别名;

Self.aggressivity=aggressivity #英雄都有自己的攻击力;

Self.life_value=life_value #英雄都有自己的生命值;

Def attack (Self,enemy):

Print ("Attack%s"% enemy)

Instantiation: Class name + parentheses

G1=garen (' Bush lun ')

#就是在执行Garen. __int__ (G1, ' Bush Lun '), then execute __init__ within the code g1.nickname= ' Bush lun ' etc

(2) Self function

The function of self is to automatically pass the object/instance itself to the first parameter of the __init__ when instantiated, and it can be any name, but it is universally acknowledged.

This automatic transfer mechanism is also reflected in the G1.attack call, followed by the introduction of

A: Where do the properties of the class we define are stored? There are two ways of viewing

Dir (class name): A list of names is isolated

The class name. __DICT__: A dictionary is found, key is a property name, value is a property value

Second: Special class properties

Class name The name of the __name__# class (string)

The document string for the class name. __doc__# class

Class name the first parent class of the __base__# class (Speaking of inheritance)

The class name is a tuple of all the parent classes of the __bases__# class (Speaking of inheritance)

Class name. Dictionary properties for the __dict__# class

Class name. The module where the __module__# class is defined

Class name the class that corresponds to the __class__# instance (in the modern class only)

Python\ class