[New-bugs-announce] [issue39897] `pathlib.Path.is_mount()` calls `Path(self.parent)` and therefore misbehaves in `Path` subclasses

[Barney Gale]

New submission from Barney Gale <barney.gale at gmail.com>:

`pathlib.Path.is_mount()` calls `Path(self.parent)`, which:

- Is needless, as `self.parent` is already a Path instance!
- Prevents effective subclassing, as `self.parent` may be a `Path` subclass with its own `stat()` implementation

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components: Library (Lib)
messages: 363633
nosy: barneygale
priority: normal
severity: normal
status: open
title: `pathlib.Path.is_mount()` calls `Path(self.parent)` and therefore misbehaves in `Path` subclasses
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39897>
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