Python Learning notes (10)

I. Definitions of classes and constructors

Class name (object):
def __init__ (Self,name,score):
Self.name = Name
Self.score = Score
def show_info (self):
Print ("Name=", Name, "Score=", score)

Class names are usually uppercase

Second, through the variable generation instance

Student1 = Student ("CQ", 100)

Third, free to add properties to an object instance

Student1 = Student ("CQ", 100)
Student1.school = "School"

Iv. Restriction of access rights

Name:public, accessible to the outside world
__NAME__: Special, accessible to the outside world
__name: Private
_name: Private, accessible by the outside world, but please treat it as private

V. Obtaining object information

Type (object)
Type (123) ==int

Import types
Type (FN) = types. Functiontype #判断是否为函数类型
Type (fn) = = types. Builtinfunctiontype
Type (fn) = = types. Lambdatype
Type (fn) = = types. Generatortype

Isinstance (object, type)

Dir (object)

Vi. Special methods of __xx__

Similar to __xx__ is a special method that has a special purpose in Python, such as using the Len () function to automatically invoke the __len__ in the object

Vii. Dynamic addition of instance properties

Object. Property = property Value

Viii. class Properties

Class properties are classes and can be defined directly in a class, but their instances can also access class properties

Class Person:
Name = "CQ"
def __init__ (self):
Pass

Nine, dynamic binding method

def show_info (self):
Print ("Hello world!")

From types Import methodtypes
S.show_info = Methodtypes (Show_info (), s)
S.show_info ()

X. Dynamic Binding class method

From types Import methodtypes

CALSS S (object):
Pass

Def show (self):
Print ("Hello")

S1 = S ()
S1.show ()

Xi. restricting dynamically added instance properties

The Python language supports restricting instance properties that can be added dynamically, specifying dynamically added properties through __slots__

Class S (object):
__solts__ = ("name", "Age")

12. Setting properties for a class

By using the Python built-in adorner @property you can set the variables in the method to properties, @property set on the Getter method

Class Student (object):
def __init__ (self,name,age):
Self.__name = Name
Self.__age = Age
@property
def name (self):
Return Self.__name
@name. Setter
def name (Self,value):
Self.__name = value
@proprety
def age (self):
Return Self.__age

In this example, Get_name and Set_name are merged to encapsulate the property name for the class, and the age wrapper is set to the read-only property of the class
　　　　

　　

Python Learning notes (10)