Python-ideas

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python-ideas@python.org

November 2019

71 participants
42 discussions

Allow Path object instances in subprocess.Popen
by brunoais 04 Nov '19

04 Nov '19

Recurrently, files are referenced when calling subprocesses. Just recently, I wanted to execute a C program to efficiently process an image and, what I had in my program, was a Path. This idea would allow turning this (imports ommitted): `Popen(('/path/to/program', '-o', fspath(outputPath), fspath(inputPath)` Into this: `Popen(('/path/to/program', '-o', outputPath, inputPath` I believe the 2nd one is more readable and easier to use than the first one. This idea can also be expanded into allowing a Path as the executable. This change is supposed to affect all the convenient functions that end up calling Popen in their pipeline. When str are provided, no changes should happen. Any problems/ideas/comments?

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Python 4000: Have stringlike objects provide sequence views rather than being sequences
by Steve Jorgensen 03 Nov '19

03 Nov '19

There are many cases in which it is awkward that testing whether an object is a sequence returns `True` for instances of of `str`, `bytes`, etc. This proposal is a serious breakage of backward compatibility, so would be something for Python 4.x, not 3.x. Instead of those objects _being_ sequences, have them provide views that are sequences using a method named something like `members` or `items`.

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