trial ImportErrors in loadReporters when subpackages not installed

[acapnotic]

Traceback (most recent call last):
  File "/home/kevint/lib/python/twisted/scripts/trial.py", line 520, in run
    config = Options()
  File "/home/kevint/lib/python/twisted/scripts/trial.py", line 133, in __init__
    self._loadReporters()
  File "/home/kevint/lib/python/twisted/scripts/trial.py", line 138, in
_loadReporters
    for p in plugin.getPlugins(itrial.IReporter):
  File "/home/kevint/lib/python/twisted/plugin.py", line 210, in getPlugins
    allDropins = getCache(package)
--- <exception caught here> ---
  File "/home/kevint/lib/python/twisted/plugin.py", line 166, in getCache
    provider = namedAny(module.__name__ + '.' + moduleName)
  File "/home/kevint/lib/python/twisted/python/reflect.py", line 361, in namedAny
    topLevelPackage = __import__(trialname)
  File "/usr/lib/python2.4/site-packages/twisted/plugins/twisted_words.py", line
12, in ?
    from twisted.words import botbot
exceptions.ImportError: No module named words
Traceback (most recent call last):
  File "/home/kevint/lib/python/twisted/scripts/trial.py", line 520, in run
    config = Options()
  File "/home/kevint/lib/python/twisted/scripts/trial.py", line 133, in __init__
    self._loadReporters()
  File "/home/kevint/lib/python/twisted/scripts/trial.py", line 138, in
_loadReporters
    for p in plugin.getPlugins(itrial.IReporter):
  File "/home/kevint/lib/python/twisted/plugin.py", line 210, in getPlugins
    allDropins = getCache(package)
--- <exception caught here> ---
  File "/home/kevint/lib/python/twisted/plugin.py", line 166, in getCache
    provider = namedAny(module.__name__ + '.' + moduleName)
  File "/home/kevint/lib/python/twisted/python/reflect.py", line 361, in namedAny
    topLevelPackage = __import__(trialname)
  File "/usr/lib/python2.4/site-packages/twisted/plugins/twisted_lore.py", line
5, in ?
    from twisted.lore.scripts.lore import IProcessor
exceptions.ImportError: No module named lore.scripts.lore

[exarkun]

Notice half the paths are from /home/kevint/lib/python/ and the other half are
from /usr/lib/python2.4/site-packages/.  The plugin system traverses sys.path to
discover plugins: if a twisted package is present at two locations in sys.path,
plugins will be found from each.  If the twisted package present in the first
location in sys.path is missing modules expected by the twisted package present
in the second location in sys.path, import errors will follow.

[exarkun]

I think this can be closed?  It seems to have been a deployment configuration
problem.

[acapnotic]

The deployment was "setup.py install --home $HOME".  There was probably
system-wide Debian twisted install as well.  That should not be a problematic
deployment.

[exarkun]

This was due to #2339, which is now fixed.