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Amend misleading withdrawal notice on PEP 577 (#796) 

When I withdrew PEP 577, I intended to write up a new alternative
to both it and PEP 572, but the replacement never reached a state
where I liked it enough to post it.

So this amends the withdrawal notice to make it clear that there's
no further alternative planned.
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Nick Coghlan 2018-09-30 16:13:49 +10:00 committed by GitHub
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@ -19,21 +19,28 @@ consequences (most notably, allowing ``>>=` and ``<<=`` as inline augmented
assignment operators that meant something entirely different from the ``>=`` assignment operators that meant something entirely different from the ``>=``
and ``<=`` comparison operators). and ``<=`` comparison operators).
I also realised that even without dedicated syntax of their own, PEP 572 allows I also realised that even without dedicated syntax of their own, PEP 572
inline augmented assignments to be written using the ``operator`` module:: technically allows inline augmented assignments to be written using the
``operator`` module::
from operator import iadd from operator import iadd
if (target := iadd(target, value)) < limit: if (target := iadd(target, value)) < limit:
... ...
(The restriction to simple names as inline assignment targets means that the The restriction to simple names as inline assignment targets means that the
target expession can always be repeated without side effects) target expession can always be repeated without side effects, and thus avoids
the ambiguity that would arise from allowing actual embedded augmented
assignments (it's still a bad idea, since it would almost certainly be hard
for humans to read, this note is just about the theoretical limits of language
level expressiveness).
Accordingly, I'm withdrawing this PEP without submitting it for pronouncement, Accordingly, I withdrew this PEP without submitting it for pronouncement. At
and will instead be writing a replacement PEP that focuses specifically on the the time I also started writing a replacement PEP that focused specifically on
handling of assignment targets which haven't already been declared as local the handling of assignment targets which hadn't already been declared as local
variables in the current scope (for both regular block scopes, and for scoped variables in the current scope (for both regular block scopes, and for scoped
expressions). expressions), but that draft never even reached a stage where *I* liked it
better than the ultimately accepted proposal in PEP 572, so it was never
posted anywhere, nor assigned a PEP number.
Abstract Abstract