Can a decorator of an instance method access the class?

Question

I have something roughly like the following. Basically I need to access the class of an instance method from a decorator used upon the instance method in its definition.

Answer 1

As Ants indicated, you can't get a reference to the class from within the class. However, if you're interested in distinguishing between different classes ( not manipulating the actual class type object), you can pass a string for each class. You can also pass whatever other parameters you like to the decorator using class-style decorators.

class Decorator(object):
    def __init__(self,decoratee_enclosing_class):
        self.decoratee_enclosing_class = decoratee_enclosing_class
    def __call__(self,original_func):
        def new_function(*args,**kwargs):
            print 'decorating function in ',self.decoratee_enclosing_class
            original_func(*args,**kwargs)
        return new_function


class Bar(object):
    @Decorator('Bar')
    def foo(self):
        print 'in foo'

class Baz(object):
    @Decorator('Baz')
    def foo(self):
        print 'in foo'

print 'before instantiating Bar()'
b = Bar()
print 'calling b.foo()'
b.foo()

Prints:

before instantiating Bar()
calling b.foo()
decorating function in  Bar
in foo

Also, see Bruce Eckel's page on decorators.