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Tue Sep 8 19:30:28 CEST 2015 · https://mail.python.org/pipermail/python-dev/2015-September/141510.html

The byte code for the embedded expressions is all produced during the
regular byte code generation phase.

On Tue, Sep 8, 2015 at 3:30 AM, Erik <python at lucidity.plus.com> wrote:

> Hi.
>
> I realise I'm coming late to the party on this, but I have a question
> about something I don't think the PEP makes clear.
>
>
>
> When is the bytecode for the embedded expressions created?
>
>
>
> Is it when the source code is parsed, or at runtime when the f-string is
> evaluated?
>
> If the latter, then any process that works on bytecode (introspection
> tools, peep-hole optimisers etc) will need work.
>
> I understand that colorising editors and analysis tools which operate at
> the source code level will need work, that's fair enough.
>
>
> The PEP hints at things in this area in the "Specification", "Code
> equivalence" and "Expression evaluation" sections, and my guess is that it
> will (and should) happen during parsing, but I can't see where it comes
> right out and says it.
>
> Thanks, E.
>
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