> What is the annoyance? What is different between frozen and not frozen?

One interesting consequence of what Eric mentioned (They have a different loader and repr.  Also, frozen modules do not
have __file__ set (and __path__ is always []).) is that frozen modules don't have a `__file__` attribute IIRC and therefore
 tracebacks won't include the source.


On Mon, 27 Sept 2021 at 22:31, Victor Stinner <vstinner@python.org> wrote:
Hi Eric,

Which stdlib modules are currently frozen? If I really want to hack
site.py or os.py for whatever reason, I just have to use "python3 -X
frozen_modules=off"?

> 1. always default to "on" (the annoyance for contributors isn't big enough?)

What is the annoyance? What is different between frozen and not frozen?

Victor

On Mon, Sep 27, 2021 at 6:58 PM Eric Snow <ericsnowcurrently@gmail.com> wrote:
>
> We've frozen most of the stdlib modules imported during "python -c
> pass" [1][2], to make startup a bit faster.  Import of those modules
> is controlled by "-X frozen_modules=[on|off]".  Currently it defaults
> to "off" but we'd like to default to "on".  The blocker is the impact
> on contributors.  I expect many will make changes to a stdlib module
> and then puzzle over why those changes aren't getting used.  That's an
> annoyance we can avoid, which is the point of this thread.
>
> Possible solutions:
>
> 1. always default to "on" (the annoyance for contributors isn't big enough?)
> 2. default to "on" if it's a PGO build (and "off" otherwise)
> 3. default to "on" unless running from the source tree
>
> Thoughts?
>
> -eric
>
>
> [1] https://bugs.python.org/issue45020
> [2] FWIW, we may end up also freezing the modules imported for "python
> -m ...", along with some other commonly used modules (like argparse).
> That is a separate discussion.
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