Mailman 3 August 2017 - Python-ideas

Towards harmony with JavaScript?
by Jason H Aug. 12, 2017

Aug. 12, 2017

Before I done my firesuit, I'd like to say that I much prefer python and I rail on JS whenever I can. However these days it is quite common to be doing work in both Python and Javascript. Harmonizing the two would help JS developers pick up the language as well as people like me that are stuck working in JS as well. TIOBE has Python at 5 and JS at 8 https://www.tiobe.com/tiobe-index/ Redmonk: 1 and 1, respectively http://redmonk.com/sogrady/2017/06/08/language-rankings-6-17/ PYPL: 2 and 5 … [View More]

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Generator syntax hooks?
by Soni L. Aug. 11, 2017

Aug. 11, 2017

The generator syntax, (x for x in i if c), currently always creates a new generator. I find this quite inefficient: {x for x in integers if 1000 <= x < 1000000} # never completes, because it's trying to iterate over all integers What if, somehow, object `integers` could hook the generator and produce the equivalent of {x for x in range(1000, 1000000)}, which does complete? What if, (x for x in integers if 1000 <= x < 1000000), was syntax sugar for (x for x in range(1000, … [View More]

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PyPI JSON Metadata Standardization for Mirrors
by Cooper Ry Lees Aug. 10, 2017

Aug. 10, 2017

Hi all, First time emailer, so please be kind. Also, if this is not the right mailing list for PyPA talk, I apologize. Please point me in the right direction if so. The main reason I have emailed here is I believe it may be PEP time to standardize the JSON metadata that PyPI makes available, like what was done for the `'simple API` described in PEP503. I've been doing a bit of work on `bandersnatch` (I didn't name it), which is a PEP 381 mirroring package and wanted to enhance it to also … [View More]

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Mimetypes Include application/json
by Nate. Aug. 9, 2017

Aug. 9, 2017

Hi, A friend and I have hit a funny situation with the `mimetypes.py` library guessing the type for a '.json' file. Is there a reason why '.json' hasn't been added to the mapping? Without `mailcap` installed: [root@de169da8cc46 /]# python3 -m mimetypes build.json I don't know anything about type build.json With `mailcap` installed: [root@de169da8cc46 /]# python3 -m mimetypes build.json type: application/json encoding: None We experimented with adding a mapping for '.json' to 'application/… [View More]

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Pseudo methods
by Paul Laos Aug. 9, 2017

Aug. 9, 2017

Hi folks I was thinking about how sometimes, a function sometimes acts on classes, and behaves very much like a method. Adding new methods to classes existing classes is currently somewhat difficult, and having pseudo methods would make that easier. Code example: (The syntax can most likely be improved upon) def has_vowels(self: str): for vowel in ["a", "e,", "i", "o", "u"]: if vowel in self: return True This allows one to wring `string.has_vowels()` instead of `… [View More]

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Argparse argument deprecation
by Tarek Ziadé Aug. 9, 2017

Aug. 9, 2017

Hey, I don't think there's any helper to deprecate an argument in argparse Let's say you have a --foo option in your CLI and want to deprecate it in the next release before you completely remove it later. My first though on how to do this by adding a new "deprecated" option to https://docs.python.org/3/library/argparse.html#argparse.ArgumentParser.add… "deprecated" would be a callable that is called after the argument has been parsed by argparse, so the developer can decide if they want to … [View More]

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HTTP compression support for http.server
by Pierre Quentel Aug. 7, 2017

Aug. 7, 2017

I have reported an issue in the tracker (https://bugs.python.org/issue30576) and proposed a Pull Request on the Github CPython repository ( https://github.com/python/cpython/pull/2078) to make http.server in the standard library support HTTP compression (gzip). I have been suggested to require feedback from core devs : - should HTTP compression be supported ? - if so, should it be supported by default ? It is the case in the PR, where a number of content types, eg text/html, are compressed if … [View More]

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Collection type argument for argparse where nargs != None
by David Mayo Aug. 6, 2017

Aug. 6, 2017

A friend of mine (@bcjbcjbcj on twitter) came up with an idea for an argparse improvement that I'd like to propose for inclusion. Currently, argparse with nargs=<anything but None> collects arguments into a list (or a list of lists in the case of action="append"). I would like to propose adding a "collection type" argument to the store and append actions and to add_argument, consisting of a callable that would be applied to the list of type-converted args before adding them to the … [View More]

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"any" and "all" support multiple arguments
by Louie Lu Aug. 2, 2017

Aug. 2, 2017

Hi all, In "min" and "max" builtin-func, it support two style of args: min(...) min(iterable, *[, default=obj, key=func]) -> value min(arg1, arg2, *args, *[, key=func]) -> value But for "any" and "all", it only support iterable: all(iterable, /) Return True if bool(x) is True for all values x in the iterable. I'm not sure if this is discuss before, but can "any" and "all" support like min_max "arg1, arg2, *args" style? Thanks, Louie.

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