[issue34237] faq/design: PEP 572 adds assignment expressions

[Chris Angelico]

Chris Angelico  added the comment:

BTW, sorry for sounding a bit snippy in my comment. Jonathan, in future, rather 
than dropping someone an email, it'd be more normal to just ping the person on 
the issue itself.

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[issue34237] faq/design: PEP 572 adds assignment expressions

[Emily Morehouse]

Emily Morehouse  added the comment:

This issue was brought to my attention -- I'm helping build the PEP 572 
implementation. I'll make sure the docs get updated (and Jonathan, I didn't 
actually know that assignment expressions were mentioned in the FAQ, so this 
was still helpful!)

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assignee: docs@python -> emilyemorehouse
nosy: +emilyemorehouse

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[issue34237] faq/design: PEP 572 adds assignment expressions

[Jonathan Fine]

Jonathan Fine  added the comment:

I'm sorry. I apologise. I'm being a bit stupid. Everything is fine. Nothing to 
do.

In case you care, here's the situation. Python 3.8 is in development, and not 
yet released. Somehow, I'd got it into my mind that it had already been 
released.

So the PEP 572 header is correct. The PEP status is accepted, the feature is in 
development (including documentation), and all being well the feature and the 
documentation will appear in Python3.8.

By the way, according to https://www.python.org/dev/peps/pep-0569/#id5, the 
first alpha is due 2019-01-27.

So please, all of you, accept my apologies.

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[issue34237] faq/design: PEP 572 adds assignment expressions

[Jonathan Fine]

Jonathan Fine  added the comment:

First, I'm delighted that the current docs are in fact correct regarding 
assignment expressions. (I should have said this earlier.)

I'm happy to wait for the implementation to land. (And if you like, I'm willing 
to help with the documentation. I seem to have an eye for detail.)

Whether or not mine was the only my mistake, I was misled by the PEP 572 
header. (And perhaps Vadim was also - msg322479.)

This issue is, rightly, closed. Perhaps the discussion should continue in a new 
issue? And without Chris, if he doesn't want to be involved. Perhaps it's a 
matter for the release manager?

Or perhaps having Python-Version:3.8 in the PEP remain until the change lands 
(and then both Status and Python-Version will be changed). 

I'm new here. I'm happy for someone else to decide. No action is one option.

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[issue34237] faq/design: PEP 572 adds assignment expressions

[Chris Angelico]

Chris Angelico  added the comment:

Yes, the PEP says version 3.8. Why is this a problem? Sit tight, let the 
implementation land. I don't understand why this needed me to get emailed 
saying that the PEP has the wrong version number in it.

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nosy: +Rosuav

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[issue34237] faq/design: PEP 572 adds assignment expressions

[Jonathan Fine]

Jonathan Fine  added the comment:

My mistake. But not mine only.

According to https://www.python.org/dev/peps/pep-0572/ the PEP is 
Python-Version: 3.8

I took this to mean that it had been implemented in Python 3.8. Reading the PEP 
more closely, it also says Status: Accepted.

According to https://www.python.org/dev/peps/pep-0001/#pep-header-preamble each 
PEP can have an optional Python-Version, which is "described below". I thus find
===
Standards Track PEPs will typically have a Python-Version header which 
indicates the version of Python that the feature will be released with.
===

I seems to me that there is a bug in the PEP, perhaps caused either by a 
failure to increment its Python-Version as part of the release of Python 3.8, 
or the PEP itself providing too early the optional Python-Version.

I'll email Chris Angelico about this. I'm very happy for the issue to remain 
closed.

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[issue34237] faq/design: PEP 572 adds assignment expressions

[Vadim Pushtaev]

Vadim Pushtaev  added the comment:

Okay then.

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[issue34237] faq/design: PEP 572 adds assignment expressions

[Ammar Askar]

Ammar Askar  added the comment:

This should be done as part of the doc changes for the full PEP 572 
implementation, no point in independently doing it now when it hasn't even been 
implemented yet.

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nosy: +ammar2
resolution:  -> postponed
stage:  -> resolved
status: open -> closed

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[issue34237] faq/design: PEP 572 adds assignment expressions

[Vadim Pushtaev]

Vadim Pushtaev  added the comment:

This indeed doesn't make much sense now. I'll try to send a PR today.

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[issue34237] faq/design: PEP 572 adds assignment expressions

[Jonathan Fine]

New submission from Jonathan Fine :

The title says it all.
faq/design: PEP 572 adds assignment expressions

https://docs.python.org/3.8/faq/design.html#why-can-t-i-use-an-assignment-in-an-expression
[Can't use] this C idiom:
while (line = readline(f)) {
// do something with line
}

https://www.python.org/dev/peps/pep-0572/
while chunk := file.read(8192):
   process(chunk)

--
assignee: docs@python
components: Documentation
messages: 322430
nosy: docs@python, jfine2358
priority: normal
severity: normal
status: open
title: faq/design: PEP 572 adds assignment expressions
type: behavior
versions: Python 3.8

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