python-ideas@python.org discussions for May 2015

82	[Python-ideas] (no subject)

Dear all, The matrix multiplication operator @ is going to be introduced in Python 3.5 and I am thinking about the following idea: The semantics of matrix multiplication is the composition of the ...

Ivan Levkivskyi
May 6, 2015 at 1:15 pm
May 12, 2015 at 11:27 am

69	[Python-ideas] Processing surrogates in

Surrogate characters (U+D800-U+DFFF) are not allowed in Unicode, but Python allows them in Unicode strings for different purposes. 1) To represent UTF-8, UTF-16 or UTF-32 encoded strings that contain ...

Serhiy Storchaka
May 4, 2015 at 8:15 am
May 16, 2015 at 2:44 pm

41	[Python-ideas] discouraging direct use of the C-API

A big blocker to making certain sweeping changes to CPython (e.g. ref-counting) is compatibility with the vast body of C extension modules out there that use the C-API. While there are certainly ...

Eric Snow
May 6, 2015 at 4:23 pm
May 8, 2015 at 10:17 am

36	[Python-ideas] Adding jsonschema to the standard library

Disclaimer: I?m not the author of jsonschema (https://github.com/Julian/jsonschema), but as a user think that users of the standard library (and potentially areas of the standard library itself) ...

Demian Brecht
May 21, 2015 at 5:29 am
May 28, 2015 at 5:07 pm

34	[Python-ideas] Framework for Python for CS101

Context: A bunch of my students will be working with me (if all goes according to plan!!)to hack on/in CPython sources. One of the things we would like to try is a framework for CS101 [Intro to ...

Rustom Mody
May 25, 2015 at 5:06 am
May 27, 2015 at 10:39 pm

29	[Python-ideas] Enabling access to the AST for Python code

Hi Python Ideas folks, (I previously posted a similar message on Python-Dev, but it's a better fit for this list. See that thread here ...

Ben Hoyt
May 22, 2015 at 1:18 am
Jul 4, 2015 at 5:47 pm

27	[Python-ideas] Making it easy to prepare for PEP479

Hi everybody, I just heard about PEP479, and I want to prepare my open-source projects for it. I have no problem changing the code so it won't depend on StopIteration to stop generators, but I'd also ...

Ram Rachum
May 18, 2015 at 8:14 am
May 20, 2015 at 3:57 pm

23	[Python-ideas] Why don't CPython strings implement slicing using a view?

Since strings are constant, wouldn't it be much faster to implement string slices as a view of other strings? For clarity, I'm talking about CPython. I'm not talking about anything the user sees. The ...

Neil Girdhar
May 7, 2015 at 2:05 am
May 9, 2015 at 8:53 am

17	[Python-ideas] npm-style venv-aware launcher

Pip and venv have done a lot to improve the accessibility and ease of installing python packages, but I believe there is still a lot of room for improvement. I only realised how cumbersome I find ...

David Townshend
May 31, 2015 at 7:16 am
Jun 1, 2015 at 6:32 pm

17	[Python-ideas] Timer that starts as soon as it is imported

Is the idea to have timer that starts on import is good?

Anatoly techtonik
May 22, 2015 at 9:59 am
May 27, 2015 at 12:52 pm

15	[Python-ideas] Function composition (was no subject)

I was thinking about recent ideas discussed here. I also returned back to origins of my initial idea. The point is that it came from Numpy, I use Numpy arrays everyday, and typically I do exactly ...

Ivan Levkivskyi
May 9, 2015 at 11:28 pm
May 10, 2015 at 7:55 pm

14	[Python-ideas] Policy for altering sys.path

I am missing a policy how sys.path should be altered. We run a custom sub class of list in sys.path. We set it in sitecustomize.py This instance get replace by a common list in lines like this ...

Thomas Güttler
May 6, 2015 at 2:05 pm
May 11, 2015 at 8:42 am

12	[Python-ideas] Cmake as build system

Hi, What you think about using Cmake build system? I see advantages such as: - Cross-plataform; - Supported in Clion IDE (amazing C/C++ IDE, breakpoints, etc); - Simple and easy to use (Zen of Python ...

André Freitas
May 22, 2015 at 11:08 pm
May 28, 2015 at 4:06 pm

11	[Python-ideas] Displaying DeprecationWarnings in the interactive interpreter, second try

Hi all, I'm tired of getting bug reports like this one: https://github.com/numpy/numpy/issues/5919 where the issue is just that the user didn't see deprecation warnings, so I just filed a bug report ...

Nathaniel Smith
May 28, 2015 at 12:29 am
May 28, 2015 at 2:45 pm

11	[Python-ideas] Add 'composable' decorator to functools (with @ matrix multiplication)

Dear all, The matrix multiplication operator @ is going to be introduced in Python 3.5 and I am thinking about the following idea: The semantics of matrix multiplication is the composition of the ...

Ivan Levkivskyi
May 6, 2015 at 1:20 pm
May 6, 2015 at 9:25 pm

10	[Python-ideas] an unless statement would occasionally be useful

I'm envisioning "unless" as a synonym for "if not(...):" currently I use if .... : pass else: ... which works. N.B.: This isn't extremely important as there are already two ways to accomplish the ...

Charles Hixson
May 17, 2015 at 6:07 pm
May 19, 2015 at 3:42 pm

10	[Python-ideas] Add `Executor.filter`

Hi, What do you think about adding a method: `Executor.filter`? I was using something like this: my_things = [thing for thing in things if some_condition(thing)] But the problem was that ...

Ram Rachum
May 1, 2015 at 8:12 am
May 14, 2015 at 9:24 pm

9	[Python-ideas] Units in type hints

Hi all, How about extending the type annotations for int, float and complex to optionally include also a unit? For instance, def sleep(duration : Float['s']): ... Now the type checker could catch the ...

Koos Zevenhoven
May 14, 2015 at 11:03 am
May 15, 2015 at 9:23 pm

8	[Python-ideas] Why decode()/encode() name is harmful

First, let me start with The Curse of Knowledge https://en.wikipedia.org/wiki/Curse_of_knowledge which can be summarized as: "Once you get something, it becomes hard to think how it was to be without ...

Anatoly techtonik
May 29, 2015 at 8:56 am
Jun 1, 2015 at 9:56 pm

8	[Python-ideas] async/await and synchronous code (and PEP492 ?)

Hi all! I am excited about seeing what's going on with asyncio and PEP492 etc. I really like that Python is becoming more suitable for the increasing amount of async code and that the distinction ...

Koos Zevenhoven
May 5, 2015 at 1:55 pm
May 5, 2015 at 11:19 pm

7	[Python-ideas] lazy list

Hi, I'm new to this mailing list. I needed a lazy list implementation for something, so I created one. I was a little bit surprised to find that there wasn't one in the *itertools* module and it ...

Alexander Atkins
May 14, 2015 at 2:52 pm
May 15, 2015 at 12:11 am

6	[Python-ideas] Fwd: [Python-Dev] An yocto change proposal in logging module to simplify structured logs support

Hi Python-Ideas ML, To resume quickly the idea: I wish to add "extra" attribute to LogMessage, to facilitate structured logs generation. For more details with use case and example, you can read ...

Ludovic Gasc
May 24, 2015 at 10:26 pm
Jul 6, 2015 at 9:01 pm

6	[Python-ideas] Explicitly shared objects with sub modules vs import

While trying to debug a problem and thinking that it may be an issue with circular imports, I come up with an interesting idea that might be of value. It wasn't a circular import problem in this ...

Ron Adam
May 30, 2015 at 3:45 pm
Jun 2, 2015 at 9:46 pm

6	[Python-ideas] The pipe protocol, a convention for extensible method chaining

In the PyData community, we really like method chaining for data analysis pipelines: (iris.query('SepalLength 5') .assign(SepalRatio = lambda x: x.SepalWidth / x.SepalLength, PetalRatio = lambda x ...

Stephan Hoyer
May 25, 2015 at 11:38 pm
May 27, 2015 at 8:45 am

4	[Python-ideas] Lossless bulletproof conversion to unicode (backslashing)

https://docs.python.org/2.7/library/functions.html?highlight=unicode#unicode There is no lossless way to encode the information to unicode. The argument that you know the encoding the data is coming ...

Anatoly techtonik
May 26, 2015 at 6:30 pm
May 29, 2015 at 8:10 am

4	[Python-ideas] awaiting iterables

(I had posted this in the "more general 'for' loop" thread, but this really is a different idea from that.) Initialising several coroutines at once still doesn't seem clear/clean to me. Here is what ...

Ron Adam
May 2, 2015 at 6:12 pm
May 3, 2015 at 12:27 am

3	[Python-ideas] What is happening with array.array('u') in Python 4?

Hi all, What will happen to array.array('u') in Python 4? It is deprecated right now. I remember reading about mutable strings somewhere, but I forgot, and I can't find the discussion. In any case, I ...

Jonathan Slenders
May 8, 2015 at 12:16 pm
May 9, 2015 at 7:56 am

3	[Python-ideas] Problems with Python

Dear all I am python novice and I am experiencing some problems with one of my programs that I converted from Matlab to Python. Is this an appropriate platform to ask such questions? I will be ...

Lesego Moloko
May 8, 2015 at 4:35 am
May 8, 2015 at 8:39 pm

3	[Python-ideas] Support 1.x notation in version specifiers

pip team said they won't support setting limit for major version of package being installed in the way below until it is supported by PEP 440. pip install patch==1.x The current way ==1.* conflicts ...

Anatoly techtonik
May 2, 2015 at 7:48 am
May 5, 2015 at 9:56 am

2	[Python-ideas] import features; if "print_function" in features.data

Would it be useful to have one Python source file with an OrderedDict of (API_feat_lbl, [(start, None)]) mappings and a lookup? * [ ] feat/version segments/rays map * [ ] .lookup("print[_function]") ...

Wes Turner
May 30, 2015 at 12:54 pm
May 30, 2015 at 11:32 pm

2	[Python-ideas] Handling lack of permissions/groups with pathlib's rglob

Greetings, I am attempting to use pathlib to recursively glob and/or find files. File permissions and groups are all over the place due to poor management of the filesystem which is out of my ...

Frank Woodall
May 7, 2015 at 4:06 pm
May 7, 2015 at 6:27 pm

1	[Python-ideas] a segment tree of available features for the current/a given Python interpreter

To reframe the problem (set the subject line), a segment tree of available features for the current/a given Python interpreter would be useful. * [ ] this could be e.g. 'features.py' and * [ ] ...

Wes Turner
May 30, 2015 at 1:15 pm
May 30, 2015 at 1:39 pm

1	[Python-ideas] Add math.iszero() and math.isequal()?

See PEP 485, which appears to be still a draft: https://www.python.org/dev/peps/pep-0485/ Best, Neil An HTML attachment was scrubbed... URL ...

Neil Girdhar
May 13, 2015 at 6:24 am
May 14, 2015 at 8:37 pm

0	[Python-ideas] Partial operator (and 'third-party methods' and 'piping')

Hi everyone! (Sorry about double posting, but I wanted to start a new thread, which I tried but apparently failed to do last time. Although inspired by and related to the function composition ...

Koos Zevenhoven
May 10, 2015 at 10:42 pm
May 10, 2015 at 10:42 pm

0	[Python-ideas] Add 'composable' decorator to functools

Dear Chris, (similar pointed This is true. One can only use single argument "normal" functions. Multiple argument ones should be made "composable". An HTML attachment was scrubbed... URL ...

Ivan Levkivskyi
May 6, 2015 at 4:55 pm
May 6, 2015 at 4:55 pm

0	[Python-ideas] Function composition

Dear Steve, Thank you for the feedback and for the links! I think that both (f at g).__name__ and str(f at g) should be f.__name__ + ' @ ' + g.__name__ and str(f) + ' @ ' +str(g) Concerning the ...

Ivan Levkivskyi
May 6, 2015 at 3:30 pm
May 6, 2015 at 3:30 pm

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group	python-ideas @
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