[Python-Dev] co_firstlineno on decorated functions (original) (raw)

Nick Coghlan ncoghlan at gmail.com
Tue Aug 3 14:25:01 CEST 2010

On Tue, Aug 3, 2010 at 1:40 PM, Eli Bendersky <eliben at gmail.com> wrote:

The first print out correctly specifies the line "def foo" is in. However, the second one points to the line with "@dummydecorator" instead of "def bar". [Python 2.6]

The side-effects of this behavior can be easily seen in the output of modules like trace and profile. Would you say it's normal, or could this be considered a bug?

Since the decorator is as much a part of the function definition as the def line is, I would say that it is correct (the name says "firstlineno", not "deflineno"). inspect.getsource() and friends actually rely on this behaviour, so changing it really isn't an option.

However, that does mean using it as though it always points to the def line is incorrect, suggesting there are related bugs in trace and profile.

Cheers, Nick.

-- Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia

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