How do I add a method with a decorator to a class in python?

decorator, python

Solution

If you want class decorator in python >= 2.6 you can do this

def funkyDecorator(cls):
    cls.funky = 1

@funkyDecorator
class MyClass(object):
    pass

or in python 2.5

MyClass = funkyDecorator(MyClass)

But looks like you are interested in method decorator, for which you can do this

def logDecorator(func):

    def wrapper(*args, **kwargs):
        print "Before", func.__name__
        ret = func(*args, **kwargs)
        print "After", func.__name__
        return ret

    return wrapper

class MyClass(object):

    @logDecorator
    def mymethod(self):
        print "xxx"


MyClass().mymethod()

Output:

Before mymethod
xxx
After mymethod

So in short you have to just put `@orm.reconstructor` before method definition

Problem

How do I add a method with a decorator to a class? I tried ``` def add_decorator( cls ): @dec def update(self): pass cls.update = update ``` usage ``` add_decorator( MyClass ) MyClass.update() ``` but MyClass.update does not have the decorator @dec did not apply to update I'm trying to use this with `orm.reconstructor` in sqlalchemy.

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