Python built-in function proprety ()

Tag: Property Python property () Python built-in function

The property can access a Python-defined function as an attribute, providing a more friendly way to access it, but sometimes setter/getter is needed.

Suppose a class CLS is defined, which must inherit from the object class, with a private variable __x

1. The first method of using attributes:

Class cls (object):     def __init__ (self):         self.__x = none         def getx (self) :        return self.__x          def setx (self, value):         self.__x  = value             def delx ( Self):        del self.__x              x = property (getx, setx, delx,  ' set x  property ')  if __name__ ==  ' __main__ ':     c = cls ()     c.x = 100    y = c.x     Print ("SET & GET&Nbsp;y: %d " % y)          del c.x     print ("del c.x & y: %d"  % y)

Run Result: Set & get Y:100del c.x & Y:100 defines three functions in this class, respectively, as assignment, value, delete variable property function prototype as property (fget=none,fset=none,fdel= None,doc=none), the above example assigns a value according to its own definition of the corresponding function.

2. Second method (new in 2.6)
With method One, first define a class CLS, which must inherit from the object class, with a private variable __x

Class cls (object):     def __init__ (self):         self.__x = None               @property     def x (self):         return  self.__x         @x.setter    def  X (Self, value):        self.__x = value              @x.deleter    def x (self):        del self.__x if __name__ ==  ' _ _main__ ':     c = cls ()     c.x = 100     y = c.x    print ("set & get y: %d"  %  y)   &nbsP;      del c.x    print ("del c.x &  y: %d " % y)

Run Result: Set & get Y:100del c.x & y:100 Description: The same property __x three function names.

This article is from the "Lu Yaliang" blog, make sure to keep this source http://luyaliang.blog.51cto.com/3448477/1767089

Python built-in function proprety ()