GH-128520: pathlib ABCs: improve protocol for 'openable' objects#134101
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Rename `pathlib._os.magic_open()` to `vfsopen()`. The new name is a bit less abstract, and it aligns with the `vfspath()` method added in 5dbd27d. Per discussion on discourse[^1], adjust `vfsopen()` so that the following methods may be called: - `__open_reader__()` - `__open_writer__(mode)` - `__open_updater__(mode)` These three methods return readable, writable, and full duplex file objects respectively. In the 'writer' method, *mode* is either 'a', 'w' or 'x'. In the 'updater' method, *mode* is either 'r' or 'w'. Also stop trying built-in `open()` first. I don't know whether this is a good idea or not, so it's best to leave it out for now. In the pathlib ABCs, replace `ReadablePath.__open_rb__()` with `__open_reader__()`, and replace `WritablePath.__open_wb__()` with `__open_writer__()`. [^1]: https://discuss.python.org/t/open-able-objects/90238
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encukou reviewed May 17, 2025
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Co-authored-by: Petr Viktorin <encukou@gmail.com>
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barneygale commented Jul 20, 2025
Thanks for the review @encukou, sorry it took me ages to address your feedback. |
barneygale added a commit to barneygale/cpython that referenced this pull request Jul 20, 2025
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barneygale commented Sep 10, 2025
Thanks for the review @efimov-mikhail, much appreciated |
barneygale merged commit 805e336 into python:main 43 checks passed
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Rename
pathlib._os.magic_open()tovfsopen(). The new name is a bit less abstract, and it aligns with thevfspath()method added in 5dbd27d.Per discussion on discourse1, adjust
vfsopen()so that the following methods may be called:__open_reader__()__open_writer__(mode)__open_updater__(mode)These three methods return readable, writable, and full duplex file objects respectively. In the 'writer' method, mode is either 'a', 'w' or 'x'. In the 'updater' method, mode is either 'r' or 'w'.
In the pathlib ABCs, replace
ReadablePath.__open_rb__()with__open_reader__(), and replaceWritablePath.__open_wb__()with__open_writer__().Footnotes
https://discuss.python.org/t/open-able-objects/90238↩