gh-90889: Deprecate pathlib methods when required functions are missing. #101505
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… missing. Emit a deprecation warning (in addition to raising `NotImplementedError`) if a pathlib method is called that relies on a missing function. Affects: - `Path.readlink()` (when `os.readlink()` is missing) - `Path.symlink_to()` (when `os.symlink()` is missing) - `Path.hardlink_to()` (when `os.link()` is missing) - `Path.owner()` (when `pwd.getpwuid()` is missing) - `Path.group()` (when `grp.getgrgid()` is missing) From Python 3.14, these methods will only be present if their required low-level functions are present, which will allow users to perform feature detection: `if hasattr(p, 'symlink_to'): p.symlink_to(...)` To support versions prior to Python 3.14, users can first check for the low-level functions, like: `if hasattr(os, 'symlink'): p.symlink_to(...)`.
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Maybe this is OTT. Some other options:
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Emit a deprecation warning (in addition to raising
NotImplementedError) if a pathlib method is called that relies on a missing function. Affects:Path.readlink()(whenos.readlink()is missing)Path.symlink_to()(whenos.symlink()is missing)Path.hardlink_to()(whenos.link()is missing)Path.owner()(whenpwd.getpwuid()is missing)Path.group()(whengrp.getgrgid()is missing)From Python 3.14, these methods will only be present if their required low-level functions are present, which will allow users to perform feature detection:
if hasattr(p, 'symlink_to'): p.symlink_to(...)To support versions prior to Python 3.14, users can first check for the low-level functions, like:
if hasattr(os, 'symlink'): p.symlink_to(...).