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Re: monkey patching __code__

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  Re: monkey patching __code__ "Sven R. Kunze" <srkunze@mail.de> - 2016-03-18 15:33 +0100
    Re: monkey patching __code__ Ned Batchelder <ned@nedbatchelder.com> - 2016-03-18 11:01 -0700

#105220 — Re: monkey patching __code__

On 18.03.2016 15:23, Ian Kelly wrote:
> On Fri, Mar 18, 2016 at 7:47 AM, Ian Kelly <ian.g.kelly@gmail.com> wrote:
>> Your patched version takes two extra arguments. Did you add the
>> defaults for those to the function's __defaults__ attribute?
> And as an afterthought, you'll likely need to replace the function's
> __globals__ with your own as well.

Thanks again. :-)

Again, why would it make sense for those dunder attributes to be part of 
the function but not of the code object?

Best,
Sven

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#105229

On Friday, March 18, 2016 at 10:33:46 AM UTC-4, Sven R. Kunze wrote:
> On 18.03.2016 15:23, Ian Kelly wrote:
> > On Fri, Mar 18, 2016 at 7:47 AM, Ian Kelly <ian.g.kelly@gmail.com> wrote:
> >> Your patched version takes two extra arguments. Did you add the
> >> defaults for those to the function's __defaults__ attribute?
> > And as an afterthought, you'll likely need to replace the function's
> > __globals__ with your own as well.
> 
> Thanks again. :-)
> 
> Again, why would it make sense for those dunder attributes to be part of 
> the function but not of the code object?

Code objects are immutable, and marshal'able (a .pyc file is basically
just a magic-numbered, time-stamped, marshalled code object for the
module).  Marshal can't marshal arbitrary Python objects.

Functions are mutable, and constructed at run-time, so can reference
arbitrary Python objects.  Since you want default values to possibly
be user-defined Python objects, the defaults are on the function, not
the code object.

--Ned.

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