[Python-Dev] co_firstlineno on decorated functions

[Antoine Pitrou]

Le mardi 03 août 2010 à 11:05 -0400, Raghuram Devarakonda a écrit :
> On Tue, Aug 3, 2010 at 10:14 AM, Guido van Rossum <guido at python.org> wrote:
> 
> > What are the use cases for co_firstlineno? Even if it is for
> > displaying the source code, I can find virtue for both sides of this
> > argument.
> 
> nose uses co_firstlineno to determine order of the test functions and
> decorating a test function can change such order. To keep the
> ordering, it provides nose.tools.make_decorator() which explicitly
> keeps the line number of the original function. Check the following
> thread for a discussion in this regard:

That's pretty much orthogonal, though. We're talking about the case of a
decorator which returns the original function object (and therefore
doesn't change co_firstlineno).

Anyway, when co_firstlineno is used for ordering purposes, it doesn't
matter whether some values are offset by one when a decorator is
applied.

Regards

Antoine.