Might be out of context here, but IMHO "." shouldn't be assumed to be the
current directory anyway.
As someone who has ported python to a system where it isn't, these assumptions
tend to cause problems.
Cheers
Chris
Sent from my iPhone
> On 3 Jun 2021, at 09:31, Robin Becker <ro...@reportlab.com> wrote:
>
> I have a failing test case in 3.10.0b1 for code that uses changes to
> sys.path and attempts to load unpackaged modules by changing directory and
> placing '.' into sys.path; the code works as expected in 2.7.18, 3.6-3.10.0a7.
>
> I printed out related variables in the a7 and b1 runs and find that sys.path
> is identical (modulo version name changes) and that os.getcwd() is as
> expected and that os.path.isfile('./%s.py' % modulename) is True.
>
> In a7 exec('%s as m', NS) works, but in b1 I get ModuleNotFoundError.
>
> I can fix the problem by changing
>
> sys.path.insert(0,'.')
>
> into
>
> sys.path.insert(0,os.getcwd())
>
> The behaviour of '.' in sys.path has always been slightly mysterious, but is
> this a real bug and have we just been lucky for 20 years?
>
> I have placed some details here
>
> https://www.reportlab.com/ftp/import-bug-310b1.txt
>
> ReportLab has quite a large codebase and I think it would be hard to get a
> concise test of this behaviour change. I would be glad if this is an expected
> change a7-->b1 and if the use of '.' in this way has become somehow wrong.
>
> I do know that during the tests the errant code is executed with different
> values for the target directory; the first usage seems to succeed.
> --
> Robin Becker
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