On Mon, Aug 8, 2011 at 8:42 PM, Steven D'Aprano <steve@pearwood.info> wrote:
Ben Finney wrote:
The ability to access the undecorated function would be of great help in our Django-based project. Django is very decorator-happy, and we are trying to introspect code and, given a particular URL, determine the innermost function (more precisely, what location in our code) that actually handles that URL.
Is that a use-case of interest?
I shouldn't think the proposed __func__ local would be of any use here, because it is local to the function. As I understand your use-case, you need to inspect a function from the outside, where __func__ is not available, and peel back all the decorators to the innermost function.
To do that, I would start by looking at:
function.__closure__[0].cell_contents
and recurse as necessary.
AFAIK there is no fool-proof way to peel back a decorator; decorators aren't required to have any specific implementation. If the use case was important it would reopen the question of always making this value available as a frame attribute. But I'm not sure why the line number indicated by the code object (which *is* accessible) is insufficient. -- --Guido van Rossum (python.org/~guido)