Serhiy Storchaka added the comment:
Actually relative_to() returns invalid path object.
>>> import pathlib
>>> p = pathlib.PureWindowsPath('C:/Foo/Bar/Baz').relative_to('C:')
>>> p
PureWindowsPath('//Foo/Bar/Baz')
>>> str(p)
'\\\\Foo\\Bar\\Baz'
>>> p.drive
''
>>> p.root
''
>>> p.parts
('\\', 'Foo', 'Bar', 'Baz')
>>> p.is_absolute()
False
>>> p2 = pathlib.PureWindowsPath(str(p))
>>> p2.drive
'\\\\Foo\\Bar'
>>> p2.root
'\\'
>>> p2.parts
('\\\\Foo\\Bar\\', 'Baz')
>>> p2.is_absolute()
True
Here is a patch which fixes both bugs.
>>> import pathlib
>>> p = pathlib.PureWindowsPath('C:/Foo/Bar/Baz').relative_to('C:')
>>> p
PureWindowsPath('/Foo/Bar/Baz')
>>> str(p)
'\\Foo\\Bar\\Baz'
>>> p.drive
''
>>> p.root
'\\'
>>> p.parts
('\\', 'Foo', 'Bar', 'Baz')
----------
Added file: http://bugs.python.org/file33023/pathlib_relative_to_2.patch
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue19918>
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