Behaviour of os.path.join

[Barry Scott]

> On 26 May 2020, at 17:46, MRAB <python at mrabarnett.plus.com> wrote:
> 
> On 2020-05-26 16:48, BlindAnagram wrote:
>> On 26/05/2020 16:22, Ben Bacarisse wrote:
>>> BlindAnagram <blindanagram at nowhere.com> writes:
>>>> I came across an issue that I am wondering whether I should report as an
>>>> issue.  If I have a directory, say:
>>>> 
>>>>  base='C:\\Documents'
>>>> 
>>>> and I use os.path.join() as follows:
>>>> 
>>>>  join(base, '..\\..\\', 'build', '')
>>> It rather defeats the purpose of os.sep if you include it in a part of
>>> the path.  What you mean is better expressed as
>>>  join(base, '..', '..', 'build', '')
>>> (and base includes it too, but I can't suggest an alternative because I
>>> don't know your intent is far as defaults go.)
>> Thanks for your input but while that part of my path may not be to your
>> liking, it works fine and does not seem to be relevant to my concern,
>> which is that join appears to treat os.sep as an absolute path, which it
>> is not.
> If it starts with the path separator, then it's absolute (well, absolute on that drive).
> 
> Open a Command Prompt window and it'll open in the %HOME% folder. Then type "cd \" and it'll put you in the root folder.

HOME is not defined by windows.

I have theses:

HOMEDRIVE=C:
HOMEPATH=\Users\barry
USERPROFILE=C:\Users\barry

I have always use USERPROFILE in place of HOME on Windows.

Barry


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