Python Property attribute usage

Python Property attribute usage

This article mainly introduces two usage methods of the Python Property attribute. This article provides two usage code examples. For more information, see

Assume that a class is defined: C, which must inherit from the object class and has a private Variable _ x

The Code is as follows:

Class C:

Def _ init _ (self ):

Self. _ x = None

1. Now we will introduce the first method to use attributes:

Define three functions in this class for assignment, value, and deletion (the expression may not be clear here, please refer to the example)

Def getx (self ):

Return self. _ x

Def setx (self, value ):

Self. _ x = value

Def delx (self ):

Del self. _ x

X = property (getx, setx, delx ,'')

The prototype of the property function is property (fget = None, fset = None, fdel = None, doc = None), So define the corresponding function as needed.

Now the x attribute in this class has been defined. We can first define a C instance c = C () and then assign the value c. x = 100, value: y = c. x, delete: del c. x. Is it easy? See method 2

2. See the second method (added in 2.6)

First define a class C:

The Code is as follows:

Class C:

Def _ init _ (self ):

Self. _ x = None

The attributes are defined below.

@ Property

Def x (self ):

Return self. _ x

@ X. setter

Def x (self, value ):

Self. _ x = value

@ X. deleter

Def x (self ):

Del self. _ x

The names of the three functions in the same attribute must be the same ..