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From: Lie Ryan <lie.1296@gmail.com>
Subject: Re: how to get id(function) for each function in stack?
Date: Sat, 07 Jan 2012 11:17:38 +1100
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:18624

On 01/07/2012 06:50 AM, Ian Kelly wrote:
> On Fri, Jan 6, 2012 at 12:29 PM, dmitrey<dmitrey15@gmail.com>  wrote:
>> Python build-in function sum() has no attribute func_code, what should
>> I do in the case?
>
> Built-in functions and C extension functions have no code objects, and
> for that reason they also do not exist in the stack.  There is no way
> to find sum() in the Python stack, because it isn't there.

a practical solution to this issue is to wrap the C functions in Python 
functions. You lose some speed but that might be an acceptable tradeoff 
in some situations (especially if you're only wrapping when debugging).