New submission from Yaroslav <flower.m...@gmail.com>:
As I can see, pathlib path parents don't support slicing with negative indexes:
>>> import pathlib
>>> path = pathlib.PosixPath("some/very/long/path/here")
>>> path.parents[-1]
...
raise IndexError(idx)
IndexError: -1
That's kinda weird for python. I mean, in regular list/etc if I need the last
element, I'd normally do list[-1], but here to get the last parent, I need to
actually know how many parents do I have.
So now, I can do something like this:
>>> parents_count = len(path.parents) - 1
>>> path.parents[parents_count]
PosixPath('.')
So that's how I can get the last parent. But is it pythonic? No.
So, I decided to fix this, and now we can do negative slicing:
>>> path.parents[-1] == path.parents[parents_count]
True
>>> path.parents[-2] == path.parents[parents_count - 1]
True
So what do you guys think about this?
----------
components: Library (Lib)
messages: 375076
nosy: ypank
priority: normal
severity: normal
status: open
title: Pathlib parents doesn't support slicing with negative indexes
type: behavior
versions: Python 3.10, Python 3.5, Python 3.6, Python 3.7, Python 3.8, Python
3.9
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41511>
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