Twisted trial, PYTHONPATH and sys.path

4
votes

I'm trying to reproduce example from "Test-driven development with Twisted" at http://twistedmatrix.com/documents/current/core/howto/trial.html.

I created files:

calculus/__init__.py
calculus/base_1.py
calculus/test/__init__.py
calculus/test/test_base_1.py

I modified PYTHONPATH:

[xxx@zzz calculus]$ PYTHONPATH="$PYTHONPATH:`pwd`/.."

I invoked trial:

[xxx@zzz twistedm]$ trial calculus.test.test_base_1
calculus
  test
    test_base_1 ...                                                     [ERROR]

===============================================================================
[ERROR]
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/twisted/trial/runner.py", line 602, in loadByNames
    things.append(self.findByName(name))
  File "/usr/lib/python2.7/site-packages/twisted/trial/runner.py", line 406, in findByName
    return reflect.namedAny(name)
  File "/usr/lib/python2.7/site-packages/twisted/python/reflect.py", line 307, in namedAny
    raise ObjectNotFound('%r does not name an object' % (name,))
twisted.python.reflect.ObjectNotFound: 'calculus.test.test_base_1' does not name an object

calculus.test.test_base_1
-------------------------------------------------------------------------------
Ran 1 tests in 0.199s

FAILED (errors=1)

Python didn't find my module.

But if I invoke python shell and try to import my modules, python imports them.

I then added a line "sys.path.append('/home/xxx/twistedm/calculus/..')" into file "/usr/lib/python2.7/site-packages/twisted/python/reflect.py". And now all works as it should.

So I've found out that trial looks for modules in sys.path, and setting PYTHONPATH on command line has no effect on sys.path.

The question is how to modify sys.path from command line when invoking trial.

2
pythontwistedpythonpathtrialsys.path

2 Answers

2
votes

Either:

PYTHONPATH="${PWD}" trial calculus

Or:

python -m twisted.trial calculus

Or write a setup.py and install your source (into a virtualenv with pip -e, probably) and then just:

trial calculus
-2
votes

I've just found that setting PYTHONPATH, even empty, in ~/.bashrc and then sourcing it solves the problem.

So, put a line in ~/.bashrc:

export PYTHONPATH=""

Then run a command in terminal:

source ~/.bashrc

Now trial works even without modifying PYTHONPATH, i. e. with empty PYTHONPATH.