Eryk Sun <eryk...@gmail.com> added the comment:
The behavior in question is documented as follows: "If a component is an
absolute path, all previous components are thrown away and joining continues
from the absolute path component."
In Windows, this is extended to support drives and the six file-path types:
Absolute:
DOS-Drive - C:\spam
UNC - \\localhost\C$\spam
Device - \\.\C:\spam
- \\?\C:\spam
Hybrid [1]:
DOS-Drive - C:spam
Rooted - \spam
Relative - spam
Python extends the notion of a drive to UNC shares and devices [2]. join()
handles all components with a drive as absolute. A rooted component that lacks
a drive is not absolute, so it replaces only the root path of previous
components, not the drive.
---
[1] os.path.isabs mistakenly classifies rooted paths as absolute, but they're
relative to the working drive. pathlib.Path.is_absolute gets it right.
[2] There are unresolved issues with device paths. For example, "\\?\C:" is
mistakenly handled as a drive-relative path, and the semantics of the "UNC"
device and "Global" link aren't implemented.
----------
components: +Library (Lib) -Extension Modules
nosy: +eryksun
resolution: -> not a bug
stage: -> resolved
status: open -> closed
type: -> behavior
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37686>
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