Python class as decorator

The official description of decorator is as follows: (http://docs.python.org/glossary.html)

Decorator

A function returning another function, usually applied as a function transformation using@ WrapperSyntax. Common examplesDecoratorS areClassmethod ()AndStaticmethod ().

TheDecoratorSyntax is merely syntactic sugar, the following two function definitions are semantically equivalent:

Def F(...):...F = Staticmethod(F)@ StaticmethodDef F(...):...
 

The same concept exists for classes, but is less commonly used there. See the documentationFunction definitionsAndClass definitionsFor more aboutDecoratorS.

Here only demonstrates the use of a class as the decorator, in fact, the main class to contain _ call _ method, the _ call _ can refer to here http://www.cnblogs.com/john2000/archive/2012/03/27/2418981.html

 

# Encoding: UTF-8 "Class As decorator" Import timeclass A: def _ init _ (self, func ): print "_ init _" def _ call _ (Self): time. sleep (10) print "_ call _" @ adef test (): # the compiler will interpret this as instancea = a (test ), when we call test, we actually call instancea (* ARGs), that is, instancea. _ call _ (* ARGs)
 

 
Print "test" If _ name _ = "_ main _": Test ()