Hooking any/all 'calls'

[Kevin Little]

In Python 2.4 or 2.5, what is the easiest way to hook any and all
callables such that designated code is executed at the very start and
end of each call? (Yes, I'm trying to come up with a little debugging
tool! Is there a single metaclass who's "__call__" method can be
wrapped to do this?

TIA,
-k

 

[Gabriel Genellina]

In Python 2.4 or 2.5, what is the easiest way to hook any and all
callables such that designated code is executed at the very start and
end of each call? (Yes, I'm trying to come up with a little debugging
tool! Is there a single metaclass who's "__call__" method can be
wrapped to do this?

See Stain Soiland's site http://soiland.no/software/decorator for his
logging decorator and logging metaclass.


--
Gabriel Genellina
Softlab SRL






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[fumanchu]

In Python 2.4 or 2.5, what is the easiest way to hook any and all
callables such that designated code is executed at the very start and
end of each call? (Yes, I'm trying to come up with a little debugging
tool! Is there a single metaclass who's "__call__" method can be
wrapped to do this?

You probably want sys.settrace, which is specifically designed for
creating debuggers, and is the basis for pdb, the debugger in the
standard library. See
http://docs.python.org/lib/module-sys.html#l2h-5159

Feel free also to look through my own debugging aid (for clues on how
to implement your own, or just to use for your needs):
http://projects.amor.org/misc/wiki/PyConquer


Robert Brewer
System Architect
Amor Ministries
(e-mail address removed)

 

[Kevin Little]

Thanks, Robert! That was exactly what I was looking for.
-k