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PEP 572: Python assignment expressions has been

PEP 572 -- Assignment Expressions | Python.org

Tim Peters has been extremely helpful by going over his own personal code repository and picking examples of code he had written that (in his view) would have been clearer if rewritten with (sparing) use of assignment expressions. His conclusion: the current proposal would have allowed a modest but clear improvement in quite a few bits of code.

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PEP 572 -- Assignment Expressions : Python

PEP 572 -- Assignment Expressions. Close. 119. ... This has been extensively discussed during the last weeks in python-ideas and python-dev mailing list ...

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Python Passion For Assignment Expressions - PEP 572

Written by Mike James Wednesday, 11 July 2018 You would think with a language as old as Python there wouldn't be much left to get excited about, but over the past few months PEP-572, a proposal to add a new feature, has been raising the blood pressure of the Python community.

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PEP 572: Python assignment expressions has been accepted ...

PEP 572: Python assignment expressions has been accepted (groups.google.com) 317 points by est on July 3, 2018 | hide | past | web | favorite | 351 comments sametmax on July 3, 2018

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python - ":=" syntax and assignment expressions: what and ...

What is Python 572?

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Idiomatic usage of Python assignment expressions (PEP 572)

Idiomatic usage of Python assignment expressions (PEP 572) Most PEPs (Python Enhancement Proposal) tend do go under the radar of most developers, but PEP 572 has caused a lot of controversy in the Python community, with some developers expressing an intense dislike for the new syntax (and that is sugar coated).

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Assignment Expressions: The Walrus Operator – Real Python

PEP 572 describes all the details of assignment expressions, including some of the rationale for introducing them into the language, as well as several examples of how the walrus operator can be used. The Python 3.8 documentation also includes some good examples of assignment expressions.

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Re: [Python-Dev] PEP 572: Assignment Expressions « python-dev ...

But ISTM that Python already has multiple ways to perform an > assignment. > > All these statements assign to x: [snip SEVEN distinct binding operations] > I remain -1 on 572, but I'm not sure it can genuinely be said that > Python only has one way to assign a value to a variable.

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python - ":=" syntax and assignment expressions: what and why ...

PEP 572 introduces assignment expressions (colloquially known as the Walrus Operator), implemented for Python 3.8.This seems like a really substantial new feature since it will allow this form of assignment within comprehensions and lambda functions.

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bpo-35224: PEP 572 Implementation by emilyemorehouse · Pull ...

I couldn't find the relevant part of PEP 572 about this scenario. This phrase in the PEP is normative: This is of the form NAME := expr where expr is any valid Python expression other than an unparenthesized tuple, and NAME is an identifier. Note that unlike regular assignment, PEP 572 does not allow any form of tuple unpacking.

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PEP 577 -- Augmented Assignment Expressions | Python.org

PEP Withdrawal. While working on this PEP, I realised that it didn't really address what was actually bothering me about PEP 572's proposed scoping rules for previously unreferenced assignment targets, and also had some significant undesirable consequences (most notably, allowing >>=` and ``<<= as inline augmented assignment operators that meant something entirely different from the >= and ...

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Support PEP 572 by JelleZijlstra · Pull Request #6899 ...

A couple of tricky aspects: We skip various parts of semanal on expressions that we know won't affect the symbol table, but with PEP 572 pretty much anything can contain an assignment, so we can no longer do that. I fixed a few cases but there may be more.

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With assignment expressions in Python 3.8, why do we need to ...

Now that PEP 572 has been accepted, Python 3.8 is destined to have assignment expressions, so we can use an assignment expression in with to write a quite natural looking Developer FAQs Developer Questions And Answers

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Re: [Python-Dev] Informal educator feedback on PEP 572 (was ...

other expression) run in the current scope, then there is no need to invent a term "parentlocal". There's just the usual LEGB scopes, plus class (which people usually forget). With no sublocal scopes (a term we never even had prior to this PEP) assignments inside the comprehension are no more special than assignments inside any other expression.

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Michael Tsai - Blog - Guido van Rossum Steps Down as Python BDFL

Jul 13, 2018 · The discussion around PEP 572 (“Assignment Expressions”) is quite probably the worst offender in the history of Python. It spanned multiple enormous threads, on two different mailing lists (python-ideas to start, then to python-dev once it was “ready”), spawned two separate polls (neither of which were favorably inclined toward the ...

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Sneak peek at Python 3.8 - Dev Life

There will be a dedicated chapter for the PEP 572 (assignment expressions) in the Python history books: Guido van Rossum, the father of Python, stepped down (or took a "permanent vacation") from his BDFL throne after heated conversations around PEP 572. Some could argue that PEP 572 has been one of the most controversial PEPs in the history of ...

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7 features proposed so far in Python 3.8 | Hacker Noon

Assignment Expressions. This has been the most controversial proposal to 3.8, and a form of it has already been approved. PEP 572 proposes changes to the Python grammar to enable “assignment expressions”. Understanding this change requires a comprehension of the differences between a statement in Python and an expression.

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Cool New Features in Python 3.8 – Real Python

PEP 572 describes all the details of assignment expressions, including some of the rationale for introducing them into the language, as well as several examples of how the walrus operator can be used. Positional-Only Arguments. The built-in function float() can be used for converting text strings and numbers to float objects. Consider the ...

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python-walrus · PyPI

Mar 09, 2020 · walrus. Write assignment expressions in Python 3.8 flavour, and let walrus worry about back-port issues :beer: Since PEP 572, Python introduced assignment expressions syntax in version 3.8.

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MicroPython version 1.13 released - MicroPython Forum

In the unix port different builds are now organised into build variants, analogous to boards on bare-metal. And PEP 475 has been implemented which retries syscalls failing with EINTR. The stm32 port sees improved support for STM32WB MCUs, with ADC, SPI and DMA support, along with support in mboot for these MCUs.

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