topic Re: locating python modules in Operating System - OpenVMS

locating python modules

John Tannahill — Thu, 18 Sep 2008 00:02:06 GMT

We have Python code in multiple directories that make up package constructs (i.e., use the __init__.py feature). If I execute a Python script from within these directories, the imports work just fine. If I define an OpenVMS symbol that calls the script so that I can execute it from anywhere, and do so outside of the directory where the code resides, the imports are not found. I am looking for an easy way to solve this issue. On a UNIX system, I think I would just create one alias with two commands in it: one that moved me to the exlicit directory prior to calling the script, the other would then execute it. When finished, I would be back in my original directory. I don't think that I can do this with OpenVMS symbols?

I also do have a pythonpath entry that points to the top directory of the Python code, but I am not sure exactly what this is getting me? I really would rather not play around with the paths as the code is in a configuration management system and can be dropped anywhere. What I wish would happen is that when I execute the script, its environment would be where it exists, not where it is called from, but it does not look like this is going to happen.

Ideas?

John

Re: locating python modules

Karl Rohwedder — Thu, 18 Sep 2008 04:13:18 GMT

To simulate the UNIX way you may use pipe:

$ prog == "pipe (set default xx ; prog)

refards kalle

Re: locating python modules

Jean-François Piéronne — Thu, 18 Sep 2008 04:18:18 GMT

John,

if you invoke your script using a Unix syntax the directory of the the script is automatically added to the path used by Python to locate module.
For example
python /dev/dir/myscript.py
instead of
python dev:[dir]myscript.py

I will lift this restriction sometime...

JF

Re: locating python modules

John Tannahill — Thu, 18 Sep 2008 15:01:38 GMT

JF,

Thanks! Your solution worked for me. I was hoping there would be an easy solution. I had no idea I could even use unix style paths when I was invoking python!

Thanks again,
John

Re: locating python modules

John Tannahill — Thu, 18 Sep 2008 15:05:03 GMT

Karl,

Thanks for the excellent info. Although JF's solution is the way we will go, I had no idea I could emulate this type of unix alias in openvms. There may be places down the road where we will make use of it.

John

Re: locating python modules

John Tannahill — Thu, 18 Sep 2008 15:15:51 GMT

See previous responses.