How do i add a python package path during runtime

Question

Here is a scenario, i hope you can help me with.

I have python unit tests in /home/k/PR-TEST/Pr/test

kahmed@qatools:~/PR-TEST/Pr-test$ ls
_apache.py        archive  clienttest  decorators.py   fakeTecoreClient.py  fixtures.pyc     psqlharness.py  servertest   testhelp.pyc  testutils.pyc
apache_server.py  cache    commontest  decorators.pyc  fixtures.py          mysqlharness.py  runtests.sh     testhelp.py  testutils.py

and have the package that i am actually running tests against @ /home/k/PR/Pr named (directory named) pref

kahmed@qatools:~/PR/Pr$ pwd
/home/kahmed/PR/Pr
kahmed@qatools:~/PR/Pr$ ls
bin  conf  images  init.d  iped  logrotate.d  NEWS  pref  rpa  sbin  scripts  src  test  VERSION

Now, i cd to ~/PR-TEST/Pr-test, and run:

nosetests -s --with-coverage --cover-package /home/k/PR/Pr/pref  `find . -name "*test.py"`

but i get erros that it cannot find the packages in pref

Any idea how to resolve this ?

I have to make sure that the python environment knows about the package pr

van · Accepted Answer · 2011-04-19 06:48:47Z

4

If you cannot (or do not want to) modify PYTHONPATH before you start the program, you can modify sys.path during runtime to achive similar functionality.
But in this case you will need to wrap the call to nosetests script. Also please check that you do not have case-sensitivity issue with your package being called Pr vs pr.

answered Apr 19, 2011 at 6:48

van

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2 Comments

kamal Over a year ago

Any example ? of adding a custom variable PR_PATH during runtime ?

van Over a year ago

Just use the import os; os.getenv("PR_PATH") (docs.python.org/library/os.html#os.getenv) to get the value, and than add it to sys.path

Andrey Sboev · Accepted Answer · 2011-04-19 06:32:18Z

1

You should add paths to your packages to PYTHONPATH environment variable

answered Apr 19, 2011 at 6:32

Andrey Sboev

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kamal Over a year ago

i want to use a custom Env Varable like PR_HOME, or PR_PATH

MrCalvin · Accepted Answer · 2025-03-30 20:13:02Z

1

[For Windows]

If your packages are located in c:\temp\py\pkgs

import sys
sys.path.append('c:\\temp\\py\\pkgs')

answered Mar 30 at 20:13

MrCalvin

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1 Comment

DeepThought42 Mar 30 at 20:36

This works on UNIX too, but with UNIX paths rather than windows `DRIVE:\foo\bar` paths.

Noufal Ibrahim · Accepted Answer · 2011-04-19 06:51:18Z

0

You should put your application package in a directory "foo/app" and the tests in another sub directory called "foo/tests". Then run your tests from the foo directory so that they can import the app directly.

answered Apr 19, 2011 at 6:51

Noufal Ibrahim

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3 Comments

kamal Over a year ago

i cannot dictate that app and tests will be under foo

DeepThought42 Mar 30 at 20:29

You could have a script that first sets its cwd to foo using os.chdir('foo') and then runs the app and/or tests but it’s a little clunky. I do it all the time but I’m not sure if it’s good practice…

DeepThought42 Apr 3 at 3:24

On second thoughts, I would use import os; from pathlib import Path; os.chdir(Path(__file__).parents[0]); # run your code here so that it works regardless of where the starter script is run from, as long as your starter is in foo/.

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