Does os.path relpath produce an incorrect relative path?

[MRAB]

On 2023-05-25 16:53, Eryk Sun wrote:
> On 5/25/23, BlindAnagram <BlindAnagram at nowhere.org> wrote:
>>
>> vcx_path = 'C:\\build.vs22\\lib\\lib.vcxproj'
>> src_path = 'C:\\lib\\src\\'
>> rel_path = '..\\..\\..\\lib\\src'
>>
>> [snip]
>>
>> The first of these three results produces an incorrect relative path
>> because relpath does not strip off any non-directory tails before
>> comparing paths.
> 
> The start path is assumed to be a directory, which defaults to the
> current working directory, and the input paths are first resolved as
> absolute paths. In order to reach src_path from vcx_path, one has to
> traverse 3 levels up to the root directory.
> 
> https://docs.python.org/3/library/os.path.html#os.path.relpath

Well, it's not necessarily the optimal relative path, because it's not 
always necessary to go all the way up to the root, as in the first example.