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	Wed, 22 Dec 2021 23:52:09 -0800 (PST)
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Date:	Thu, 23 Dec 2021 08:52:07 +0100
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Subject:	Re: python3.9 failing?
To:	cygwin AT cygwin DOT com
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From:	Marco Atzeri <marco DOT atzeri AT gmail DOT com>
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On 23.12.2021 06:50, Russell VT wrote:
> On Tue, Dec 21, 2021 at 6:34 AM Achim Gratz <Stromeko AT nexgo DOT de> wrote:
> 
>> Marco Atzeri writes:
>>> Without Python 3.9  installed python3 should link by default to the
>>> next in the line (likely 3.8)
>>
>> While python3 still defaults to python38 alternatives should probably
>> prioritize 38 over 39?
> 
> 
> That's how I "fixed" mercurial on my own installation, as it was
> complaining about missing the "parsers" module, from inside the Python 3.9
> libraries, IIRC.
> 

Thanks for the report.
It is caused by:


$ head /usr/bin/hg -n 20
#!/usr/bin/python3
                  ^^ default 3.9
....

libdir = '../lib/python3.8/site-packages'
                        ^^ but really need 3.8
...


No surprise is not working.

A simple workaround is:


$ cp /usr/bin/hg /usr/local/bin/

$ sed -i -e "1 s/python3$/python3.8/" /usr/local/bin/hg

$ hg --version
Mercurial Distributed SCM (version 6.0)
(see https://mercurial-scm.org for more information)

...

Regards
Marco



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