[Python-ideas] PEP draft: context variables

Nick Coghlan ncoghlan at gmail.com
Tue Oct 10 08:42:21 EDT 2017

On 10 October 2017 at 22:34, Koos Zevenhoven <k7hoven at gmail.com> wrote:

> Really, it was my mistake to ever make you think that
> context_var.assign(42).__enter__() can be compared to .set(42) in PEP
> 550. I'll say it once more: PEP 555 context arguments have no equivalent of
> the PEP-550 .set(..).

Then your alternate PEP can't work, since it won't be useful to extension

Context managers are merely syntactic sugar for try/finally statements, so
you can't wave your hands and say a context manager is the only supported
API: you *have* to break the semantics down and explain what the
try/finally equivalent looks like.


Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia
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