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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Running Python code from GPRBuild (Calling from GNAT Studio)
Date: Fri, 11 Nov 2022 20:50:10 +0100
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On 2022-11-11 19:08, Rego, P. wrote:
>> It should show syntax errors. If you remove -m py_compile switches, then
>> it will "compile" and execute.
> 
> Got some error when removed -m switch
> C:\GNAT\2021\libexec\gnatstudio\gnathub\share\gnathub\python\python.exe: can't open file 'compileall': [Errno 2] No such file or directory

Because it is one of these three:

1. for Required_Switches ("Python") use ("-m", "py_compile");
2. for Required_Switches ("Python") use ("-m", "compileall");
3. nothing

#1 results in

    python.exe -m py_compile <file>

= compile only. py_compile is the module name that takes <file> as an 
argument.

#2 results in

    python.exe -m compileall <file>

= compile, generate *.pyc files, store them at the Python library 
location. compileall is the module name.

#3 results in

    python.exe <file>

= compile/run <file>.

When you remove -m but leave compileall you get

    python.exe compileall <file>

and compileall is treated as a file.

Command line-arguments are here:

    https://docs.python.org/3/using/cmdline.html

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de