Guido van Rossum guido at python.org
Sun Mar 11 21:53:31 CET 2012

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On Sun, Mar 11, 2012 at 1:11 PM, Ethan Furman <ethan at stoneleaf.us> wrote:
> How does someone know if something in CPython is an implementation detail or
> not?

Sadly, there's a large grey area where the language reference doesn't
have enough rigor, so asking here is often the only way.

> In the case of im_func, I think it is (an implementation detail), and
> another person thinks it is part of the language spec.  That all
> implementations must have.

It's part of the language spec. However it's now called __func__.

-- 
--Guido van Rossum (python.org/~guido)

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