Question

I’m writing a basic test with nose to call a single function from a logging wrapper, but once I got the test to be discovered I started getting standard library module import errors.

This is the code I’m trying to write some tests for and has been in production and hasn’t changed in a long time, so I’m sure the there’s something wrong when how I’m trying to use nose.

  Failure: ImportError (cannot import name WatchedFileHandler) ... ERROR

  ======================================================================
  ERROR: Failure: ImportError (cannot import name WatchedFileHandler)
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "/opt/local/lib/python2.4/site-packages/nose/loader.py", line 389, in loadTestsFromName
      module = self.importer.importFromPath(
    File "/opt/local/lib/python2.4/site-packages/nose/importer.py", line 39, in importFromPath
      return self.importFromDir(dir_path, fqname)
    File "/opt/local/lib/python2.4/site-packages/nose/importer.py", line 86, in importFromDir
      mod = load_module(part_fqname, fh, filename, desc)
    File "/Users/jolson/project/qworker/tests/unit/test_qscript_log.py", line 2, in ?
      from logging.handlers import WatchedFileHandler, TimedRotatingFileHandler
  ImportError: cannot import name WatchedFileHandler

What could cause this?

Update:
I’ve simplified it to the following and the test still fails, but outside of nose, this all works as expected.

from logging.handlers import WatchedFileHandler, TimedRotatingFileHandler

def test_INFO():
    assert 0 == 0

** Update 2 **
I’ve checked my paths. Inside the nosetests, my path looks like this.

['/Users/jolson/project/qworker/tests', '/Users/jolson/project/qworker',
'/opt/local/bin', '/opt/local/lib/python24.zip', '/opt/local/lib/python2.4', 
'/opt/local/lib/python2.4/plat-darwin', '/opt/local/lib/python2.4/plat-mac', 
'/opt/local/lib/python2.4/plat-mac/lib-scriptpackages', '/opt/local/lib/python2.4/lib-tk',
 '/opt/local/lib/python2.4/site-packages/readline', '/opt/local/lib/python2.4/lib-dynload', 
'/opt/local/lib/python2.4/site-packages', '/opt/local/lib/python2.4/site-packages/setuptools-0.6c11-py2.4.egg-info']

but my normal path inside the python interpreter is

['', '/usr/local/bin', '/Library/Python/2.7/site-packages/pip-1.2.1-py2.7.egg', 
'/Library/Python/2.7/site-packages/virtualenv-1.8.2-py2.7.egg', 
'/Library/Python/2.7/site-packages/virtualenvwrapper-3.6-py2.7.egg', 
'/Library/Python/2.7/site-packages/stevedore-0.3-py2.7.egg', 
'/Library/Python/2.7/site-packages/virtualenv_clone-0.2.4-py2.7.egg',
 '/Library/Python/2.7/site-packages/distribute-0.6.28-py2.7.egg', 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip', 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7', 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin', 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac', 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages', 
'/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python', 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk', 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old', 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload', 
'/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC', 
'/Library/Python/2.7/site-packages', '/Library/Python/2.7/site-packages/setuptools-0.6c11-py2.7.egg-info', 
'/Library/Python/2.7/site-packages/IPython/extensions']

I’m running nosetests-2.4 tests

which has one file in tests/unit/test_log.py

Answer 1

My os was defaulting to nosetests-2.4 which uses python 2.4, but all our code is python 2.7, so that’s why the path was wrong and nothing was working and logging.handlers was just the first package that was missing from 2.4 libs that was needed.