python gives ImportError: No module named "" when triggered in a perl program

Question

In my perl program which runs the python script

I have provided the PYTHONPATH env param with the path for the lib and i have run the python script. I am getting

ImportError: No module named "....."

  my $script = "/path/pythonscript.py";
     $ENV{'PYTHONPATH'} = "/path/lib";
      system("python $script");

Whereas when i run the same python script on command line in the same directory where the script executes in my perl program, it is working.

Can anyone give me some pointers on why this is happening.

What does $script contain? Can you provide a minimal reproducible example? — tripleee
– tripleee, Commented Mar 5, 2019 at 11:05

bmat · Accepted Answer · 2019-03-05 14:46:32Z

1

Try printing the contents of sys.path and compare the difference e.g. change your python script to

import sys

print(sys.path)

Most likely there is a difference here and this is causing the module to not be found.

edited Mar 5, 2019 at 14:46

answered Mar 5, 2019 at 11:24

bmat

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2 Comments

pupil Over a year ago

I have tried this already and i see the path is there in both cases of the lib

bmat Over a year ago

Are the paths identical? Is all the python code in the lib dir? or is some of the code in the working directory? could you perhaps paste the output here? The python interpreter searches for modules differently when running python /path/script compared to python script

Shade Reogen · Accepted Answer · 2019-03-05 11:13:41Z

0

I once had a similar problem. I solved it by creating an executable script (chmod) and making that script run instead of the python script. The script simply contained a cd to the directory and a python3 program. py

answered Mar 5, 2019 at 11:13

Shade Reogen

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3 Comments

tripleee Over a year ago

Why do you think adding another process between Perl and Python will solve anything?

Shade Reogen Over a year ago

'Cause if launched independently from cmd-line the python script MUST start

tripleee Over a year ago

That's just superstition. If the shell script can run Python then so can Perl.

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