Mailman 3 June 2020 - Python-ideas

PyLong_{As,From}ByteArray
by doodspav＠gmail.com June 19, 2020

June 19, 2020

Unless I've misunderstood this API, and the `ByteArray` part doesn't refer to an array of bytes representing the value of `PyLong` in 2's complement, can we implement this in the public header? It's already available, it's just not exported (at least I can't use it, and it's not in the documentation). This would be beneficial for fixed width integer types, especially ones larger than `long long` (e.g. `__int128_t`), and shouldn't take much effort since it's already implemented privately (https:… [View More]

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EVENTFD(2) support
by doodspav＠gmail.com June 18, 2020

June 18, 2020

Can we implement eventfd(2) as documented here <https://man7.org/linux/man-pages/man2/eventfd.2.html>? It would only be available on the Linux platform, and one of the benefits would be the ability to create synchronisation primitives on said platform that can block on normal threads, and be awaited on in coroutines (without busy looping inside said coroutine). Currently the best place I can think of to put it would be in one of the Networking and Interprocess Communication modules (… [View More]

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the 'z' string escape
by Soni L. June 17, 2020

June 17, 2020

in Lua 5.2+, there's this string escape that allows you to put "whitespace" (in particular, including newlines) in a string literal, by skipping them entirely. now, unlike lua's long strings, python *does* have escapes in long strings. however, sometimes you have help text: "switches to toml config format. the old 'repos' " #cont &… [View More]

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Support infinite temporal types
by Alexander Hill June 17, 2020

June 17, 2020

Hi all, I’d like to propose support for infinite dates, datetimes and timedeltas. They're very useful when you need to model ranges with one or both ends unbounded (e.g. “forever starting from June 15th 2020”). Without first-class infinite values, you can use None, or you can use the `min` and `max` attributes of Python’s datetime types, or some other arbitrary large values. Using None means you need to implement a path for None, and a path for everything else, and your various infinite … [View More]

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Doc preview in Github PR
by remi.lapeyre＠henki.fr June 17, 2020

June 17, 2020

I think the possibility to have publish a preview when a PR changes the documentation was considered at one time but I can't find anything about this now. Has this been scraped?

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String module name
by redradist＠gmail.com June 16, 2020

June 16, 2020

What if we introduce the string module: ```python from "https://python.org/some_module.py" import name ... ``` It will add possibility to run code with complex name of module that cannot be presented as set of lexical items and also will allow to load the module from external location

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For quicker execution, don't refcount objects that can't be deleted
by Jonathan Fine June 16, 2020

June 16, 2020

Hi Here's something that might make code run quicker. The basic idea is to not refcount some objects that are sure never to be deleted. On a multicore machine, this might significantly reduce the number of cache invalidations (and perhaps misses). I lack many of the skills needed to investigate this further. Aside: This idea prompted by: Make `del x` an expression evaluating to `x` https://mail.python.org/archives/list/python-ideas@python.org/message/WVQNA… Consider >>> tuple(id(n) … [View More]

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Python WebAssembly Support
by redradist＠gmail.com June 16, 2020

June 16, 2020

Hi all, I love Python, but as soon as I need to do something in browser I have to use ugly JavaScript !! Is there any future plans support for compiling CPython to WebAssembly using Emscripten ?

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Keyword 'THIS'
by M Bfmv June 16, 2020

June 16, 2020

Hey all. Ever had some list comprehension hell in your code? Me neither *whistles 418 happly*... I was thinking about this idea and while `this` keyword is equalevant to `self` i have to explain myself. English is not my main language, sorry for that :' ) Here is my pseudo code. ``` if [i for i in range(10) if i == 11]: print(this) Evaluate: [] ``` Another one ``` if [i for i in range(10) if i == 5]: print(this) Evaluate: [5] ``` As I try to show above. It would be neat to make a … [View More]

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Operator ">" for functions
by artem6191 June 14, 2020

June 14, 2020

This operator will allow to send arguments to function only by certain values. Example: def some_function(a > (1, 2,3), b): # Some code some_function(1, 2) some_function(4, 2) # Error "Value '4' is not allowed for argument 'a'"

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