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devel / comp.lang.python / Re: Incomplete sys.path with embeddable python (Windows)!?

SubjectAuthor
* Re: Incomplete sys.path with embeddable python (Windows)!?Ralf M.
`- Re: Incomplete sys.path with embeddable python (Windows)!?Greg Ewing

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Re: Incomplete sys.path with embeddable python (Windows)!?

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From: Ral...@t-online.de (Ralf M.)
Newsgroups: comp.lang.python
Subject: Re: Incomplete sys.path with embeddable python (Windows)!?
Date: Sun, 23 Apr 2023 00:04:16 +0200
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<ed2d59e2-20fc-deb8-8a55-a4aa39146d41@tompassin.net>
 by: Ralf M. - Sat, 22 Apr 2023 22:04 UTC

Am 21.04.2023 um 18:07 schrieb Thomas Passin:
> On 4/20/2023 5:47 PM, Ralf M. wrote:
>> Hello,
>>
>> when I run a script with a "normally" installed python, the directory
>> the script resides in is automatically added as first element to
>> sys.path, so that "import my_local_module" finds my_local_module.py in
>> the directory of the script.
>>
>> However, when I run the same script with embeddable python ("Windows
>> embeddable package (64-bit)", download link
>> https://www.python.org/ftp/python/3.11.3/python-3.11.3-embed-amd64.zip) the script directory is *not* prepended to the path, thus "import my_local_module" gives an ImportError.
>>
>> I couldn't find an option to get the "normal" behaviour. Any ideas how
>> to do that?
>>
>> What I tried so far:
>> [...]
>> * I can add the following lines to every script:
>>      import sys
>>      script_path = __file__.rsplit("\\", 1)[0]
>>      if script_path not in sys.path:
>>          sys.path[0:0] = [script_path]
>>      import my_local_modul
>> [...]

Thank your for your hints.

> I haven't worked with embeddable python, but here are some possibilities
> that came to mind, depending on how your system works -
>
> 1. If your script is started from the command line, sys.argv[0] gives
> the path to the script;
I didn't think of sys.argv[0] to get at the path; this might be quite
useful, I'll try it out next week.

> You could use os.path.dirname() to get its
> directory.  This will end up the same place as your code fragment, but
> looks nicer and handles different path separators (e.g., Linux vs Windows);
Yes, but it requires another import and the embedded package is only
available for windows anyway, I think. I'll consider the idea, though.

> 2. You could write a little module that figures out the script's path
> and import that first in all your scripts.
>
> 3. If you know all the directories that your scripts will be in, you
> could add them all to a xx.pth file (do a search to make sure where to
> put .pth files for an embeddable case).
I thought about that, but for that to work all local modules across all
script locations must have unique names, otherwise import might get hold
of a module from the wrong directory. Certainly doable for a few
scripts, but might become a source of hard to track errors when the
number of scripts increases and later maintainers are not aware of the
naming restriction.

> [...}

Re: Incomplete sys.path with embeddable python (Windows)!?

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From: greg.ew...@canterbury.ac.nz (Greg Ewing)
Newsgroups: comp.lang.python
Subject: Re: Incomplete sys.path with embeddable python (Windows)!?
Date: Sun, 23 Apr 2023 11:49:03 +1200
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 by: Greg Ewing - Sat, 22 Apr 2023 23:49 UTC

On 23/04/23 10:04 am, Ralf M. wrote:
> I thought about that, but for that to work all local modules across all
> script locations must have unique names, otherwise import might get hold
> of a module from the wrong directory.

You could put all the local modules belonging to a particular
script into a package named after the script, e.g. put the local
modules used by foo.py into a package called foolib.

--
Greg

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