PEP 572: Python Assignment Expressions Has Been, large production capacity js3000 cement mixer

What’s New In Python 3.8 — Python 3.8.2 documentation

What’s New In Python 3.8¶ Editor. Raymond Hettinger. This article explains the new features in Python 3.8, compared to 3.7. For full details, see the changelog.. Python 3.8 was released on October 14th, 2019.

Python 3.8 is now available with walrus operator

2019/10/15 · The walrus operator was proposed in PEP 572 (Assignment Expressions) by Chris Angelico, Tim Peters, and Guido van Rossum last year. Since then it has been heavily discussed in the Python community with many questioning

Newest 'python-assignment-expression' Questions

Python 3.8 introduces assignment expressions, described in PEP 572. Is there a way to test this new feature in Python 3.7.x? In the past, new language features have been backported to earlier Python ...

PEP 577 -- Augmented Assignment Expressions

PEP 572 quite reasonably notes that this results in ambiguity when assignment expressions are used as function call arguments. This PEP resolves that concern a different way by requiring that assignment expressions be parenthesised when used as arguments to a function call (unless they're the sole argument).

Python Passion For Assignment Expressions

The idea is simple enough - allow assignment within expressions. Currently assignment in Python is a statement. This means: A=B. is an assignment, but. if A==B: is a test for equality. The PEP introduces a new assignment operator := which allows assignment within expressions as is possible in some other languages. Now you can write things like:

Why Guido van Rossum quit as the Python chief (BDFL)

Jul 20, 2018 · However, a proposal to add a new feature to Python – PEP 572 – has caused a furore in the Python community in the last few months. What PEP 572 is all about. The idea behind PEP 572 is quite simple – to allow assignment to variables within expressions. To make things simpler, consider the following lines of code in Python:

Programming languages: Python's PEP 572 feature that

2019/03/01 · PEP 572 would introduce a feature called Assignment Expressions to the language, a change aimed at making it possible to write more efficient code in Python. Now PEP 572 is inching closer to ...

Python creator steps down

Jul 13, 2018 · At the 2018 Python Language Summit, Guido van Rossum led a session about PEP 572, however developers still remained unconvinced. Between Reddit threads full of disappointed Python fans and a Twitter poll where 64% of people said they did not like the new Assignment Expressions, it was clear that Guido’s choice was splitting the community.

PEP 572: Python assignment expressions has been

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Re: Assignment Expressions in Lua

> In Python 3.8 there will be a new feature introducing Assignment > Expressions[1]. One of the reasons for such feature is to improve code ... No one has been ...

Pep 572 update by gvanrossum · Pull Request #654 · python

May 22, 2018 · This allows constructs that currently require 3 keywords (def, nonlocal, return) and three repetitions of a variable name to be replaced with a single keyword (lambda) and a single inline assignment expression. (Note: now that Guido has pointed me to this PR, I won't post PEP 577 to python-ideas until you're happy with the changes you've made ...

6. Expressions — Python 3.8.2 documentation

Starting with 3.8, the key is evaluated before the value, as proposed by PEP 572. 6.2.8. Generator expressions ... Python evaluates expressions from left to right. Notice that while evaluating an assignment, the right-hand side is , ...

python-walrus · PyPI

Mar 09, 2020 · For those who wish to use assignment expressions in their code, walrus provides an intelligent, yet imperfect, solution of a backport compiler by replacing assignment expressions syntax with old-fashioned assignment-then-conditional syntax, which guarantees you to always write assignment expressions in Python 3.8 flavour then compile for ...

peps/pep-0572.rst at master · python/peps · GitHub

However, this part of the proposal would have caused backwards incompatibilities, and has been withdrawn so the PEP can focus on assignment expressions. Alternative spellings Broadly the same semantics as the current :

What does "x = a + b" mean?

The context inspiring that post is a python-ideas discussion regarding the possibility of adding a shorthand spelling (x = a + b) to Python for the operation: x = a.copy() x.update(b) The PEP for that proposal is still in development, so I'm not going to link to it directly , but the paragraph above gives the gist of the idea. Guido's article ...

Python 3 – How to Use Assignment Expressions

2019/02/12 · I recently came across PEP 572, which is a proposal for adding assignment expressions to Python 3.8 from Chris Angelico, Tim Peters, and Guido van Rossum himself! I decided to check it out and see ...

7 features proposed so far in Python 3.8 -

Jul 07, 2018 · 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 ...

8 PEP 227: Nested Scopes

8 PEP 227: Nested Scopes. In Python 2.1, statically nested scopes were added as an optional feature, to be enabled by a from __future__ import nested_scopes directive. In 2.2 nested scopes no longer need to be specially enabled, and are now always present.

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PEP 572 and decision-making in Python []

2018/06/20 · The "PEP 572 mess" was the topic of a 2018 Python Language Summit session led by benevolent dictator for life (BDFL) Guido van Rossum. PEP 572 seeks to add assignment expressions (or "inline assignments") to the language, but it has seen a prolonged discussion over multiple huge threads on the python-dev mailing list—even after multiple rounds on python …

Idiomatic usage of Python assignment expressions (PEP 572)

Jul 05, 2018 · 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).

How to Install Python 3.8 on Windows 10

Dec 17, 2019 · But before selecting Install Now, you have to check the box called “Add Python 3.8.0 to PATH“. Then wait for a few times for the installation process complete. Step 6: After the setup has been completed just click on Close button. Now to write and run python code, open Python App or IDLEPython Shell.

How good is Python 3.8 compared to the version 3.7?

Nov 15, 2019 · Firstly i will tell you about the past version which has been dead that is python 2.7 and python 3.0 . What is Python 2? Python 2 made code development process easier than earlier versions.

Walrus operator in Python 3.8: a primer

2019/08/12 · Assignment expressions (:=), or the “walrus” operator, have been the most talked about feature to be introduced in the latest version of Python. The new addition to the language was proposed in PEP 572. In this post, we look at

Sneak peek at Python 3.8

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 ...

First Python feature release under new governance

2019/10/16 · Now that PEP 572 is done, I don't ever want to have to fight so hard for a PEP and find that so many people despise my decisions. I would like to remove myself entirely from the decision process ...

PEP 379 -- Adding an Assignment Expression

This PEP adds a new assignment expression to the Python language to make it possible to assign the result of an expression in almost any place. The new expression will allow the assignment of the result of an expression at first use (in a comparison for example).

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PyFilesystem 2.1.0 adds concurrent uploads / downloads and

Aug 12, 2018 · PyFilesystem 2.1.0 adds concurrent uploads / downloads and support for globbing I've released PyFilesystem 2.1.0.. This version is the accumulation of many minor revisions, with multiple fixes, enhancements and some interesting new features.

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7 PEP 342: New Generator Features

7 PEP 342: New Generator Features Python 2.5 adds a simple way to pass values into a generator. As introduced in Python 2.3, generators only produce output; once a generator's code was invoked to create an iterator, there was no way to pass any new information into the function when its execution is resumed.

PEP 572: Python assignment expressions has been accepted

Python is a really difficult language for this, since it provides so many hooks for redefining behaviour. For example in many languages we could say that 'x + x' and 'x * 2' and 'x << 1' are semantically the same (they double 'x'), but in Python those are very different expressions, which can each invoke distinct,...

Now that Guido van Rossum has stepped down as Python's BDFL

I think the future of Python is generally unchanged. The core aspects of Python that make it a popular language have been well-established for quite some time, and Python is much less dependent upon Guido than, for instance, Linux is on Linus.

Python Programming 3.8 beta 1 Released with

2019/06/13 · New Features of Python 3.8 Assignment Expressions This is one of the useful feature Python is bringing with its new version. The assignment expressions were proposed in PEP 572 and accepted as a feature after a long As we ...

Python Programming Language: Let’s explore on Python

2019/11/11 · Python has recently rolled out an upgrade of version 3.8 on 29th July 2019. It has added several useful and efficient features in version 3.8. Python is a high-level programming language used for general-purpose coding and

Python Assignment Expression

2018/07/16 · A recent buzz in the Python Community is PEP 572’s acceptance for Python3.8 . PEP stands for Python Enhancement Proposals and each such PEPs are assigned a number by the PEP editors and once assigned are never changed.

Python 3.8 Released

The walrus operator was proposed in PEP 572 (Assignment Expressions) by Chris Angelico, Tim Peters, and Guido van Rossum last year. Since then it has been heavily discussed in the Python community with many questioning whether it is a needed improvement. Others are excited as the operator does make the code more readable.

[issue1714448] if something as x

Jervis Whitley This patch implements your final point: expr as name (albeit with a nominal '->' RARROW rather than 'as') the patch creates a new expression, assexp (assignment expression) there is no need to implement this for countless other if/while/for because they accept expressions and this assignment is an expression.

PEP 572

Style guide recommendations. As expression assignments can sometimes be used equivalently to statement assignments, the question of which should be preferred will arise. For the benefit of style guides such as PEP 8, two recommendations are suggested. If either assignment statements or assignment expressions can be used,...

2. Lexical analysis — Python 3.8.2 documentation

Expressions in formatted string literals are treated like regular Python expressions surrounded by parentheses, with a few exceptions. An empty expression is not allowed, and both lambda and assignment expressions := must be surrounded by explicit parentheses. Replacement expressions can contain line breaks (e.g. in triple-quoted strings), but ...