[New-bugs-announce] [issue19918] PureWindowsPath.relative_to() is not case insensitive

[Serhiy Storchaka]

New submission from Serhiy Storchaka:

>>> import pathlib
>>> pathlib.PureWindowsPath('C:/Foo/Bar').relative_to('C:/Foo')
PureWindowsPath('Bar')
>>> pathlib.PureWindowsPath('C:/Foo/Bar').relative_to('C:/foo')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/serhiy/py/cpython/Lib/pathlib.py", line 797, in relative_to
    .format(str(self), str(formatted)))
ValueError: 'C:\\Foo\\Bar' does not start with 'C:\\foo'
>>> pathlib.PureWindowsPath('C:/Foo/Bar').relative_to('c:/Foo')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/serhiy/py/cpython/Lib/pathlib.py", line 797, in relative_to
    .format(str(self), str(formatted)))
ValueError: 'C:\\Foo\\Bar' does not start with 'c:\\Foo'

It also returns strange result when an argument is naked drive:

>>> pathlib.PureWindowsPath('C:/Foo/Bar').relative_to('C:')
PureWindowsPath('//Foo/Bar')

----------
components: Library (Lib)
messages: 205448
nosy: pitrou, serhiy.storchaka
priority: normal
severity: normal
stage: needs patch
status: open
title: PureWindowsPath.relative_to() is not case insensitive
type: behavior
versions: Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19918>
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