hughdbrown hughdbrown - 10 days ago 7
Python Question

Python import error: 'No module named' does exist

I am getting this stack trace when I start pyramid pserve:

% python $(which pserve) ../etc/development.ini
Traceback (most recent call last):
File "/home/hughdbrown/.local/bin/pserve", line 9, in <module>
load_entry_point('pyramid==1.5', 'console_scripts', 'pserve')()
File "/home/hughdbrown/.virtualenvs/ponder/local/lib/python2.7/site-packages/pyramid-1.5-py2.7.egg/pyramid/scripts/pserve.py", line 51, in main
return command.run()
File "/home/hughdbrown/.virtualenvs/ponder/local/lib/python2.7/site-packages/pyramid-1.5-py2.7.egg/pyramid/scripts/pserve.py", line 316, in run
global_conf=vars)
File "/home/hughdbrown/.virtualenvs/ponder/local/lib/python2.7/site-packages/pyramid-1.5-py2.7.egg/pyramid/scripts/pserve.py", line 340, in loadapp
return loadapp(app_spec, name=name, relative_to=relative_to, **kw)
File "/home/hughdbrown/.virtualenvs/ponder/lib/python2.7/site-packages/PasteDeploy-1.5.2-py2.7.egg/paste/deploy/loadwsgi.py", line 247, in loadapp
return loadobj(APP, uri, name=name, **kw)
File "/home/hughdbrown/.virtualenvs/ponder/lib/python2.7/site-packages/PasteDeploy-1.5.2-py2.7.egg/paste/deploy/loadwsgi.py", line 271, in loadobj
global_conf=global_conf)
File "/home/hughdbrown/.virtualenvs/ponder/lib/python2.7/site-packages/PasteDeploy-1.5.2-py2.7.egg/paste/deploy/loadwsgi.py", line 296, in loadcontext
global_conf=global_conf)
File "/home/hughdbrown/.virtualenvs/ponder/lib/python2.7/site-packages/PasteDeploy-1.5.2-py2.7.egg/paste/deploy/loadwsgi.py", line 320, in _loadconfig
return loader.get_context(object_type, name, global_conf)
File "/home/hughdbrown/.virtualenvs/ponder/lib/python2.7/site-packages/PasteDeploy-1.5.2-py2.7.egg/paste/deploy/loadwsgi.py", line 454, in get_context
section)
File "/home/hughdbrown/.virtualenvs/ponder/lib/python2.7/site-packages/PasteDeploy-1.5.2-py2.7.egg/paste/deploy/loadwsgi.py", line 476, in _context_from_use
object_type, name=use, global_conf=global_conf)
File "/home/hughdbrown/.virtualenvs/ponder/lib/python2.7/site-packages/PasteDeploy-1.5.2-py2.7.egg/paste/deploy/loadwsgi.py", line 406, in get_context
global_conf=global_conf)
File "/home/hughdbrown/.virtualenvs/ponder/lib/python2.7/site-packages/PasteDeploy-1.5.2-py2.7.egg/paste/deploy/loadwsgi.py", line 296, in loadcontext
global_conf=global_conf)
File "/home/hughdbrown/.virtualenvs/ponder/lib/python2.7/site-packages/PasteDeploy-1.5.2-py2.7.egg/paste/deploy/loadwsgi.py", line 337, in _loadfunc
return loader.get_context(object_type, name, global_conf)
File "/home/hughdbrown/.virtualenvs/ponder/lib/python2.7/site-packages/PasteDeploy-1.5.2-py2.7.egg/paste/deploy/loadwsgi.py", line 681, in get_context
obj = lookup_object(self.spec)
File "/home/hughdbrown/.virtualenvs/ponder/lib/python2.7/site-packages/PasteDeploy-1.5.2-py2.7.egg/paste/deploy/util.py", line 68, in lookup_object
module = __import__(parts)
File "/home/hughdbrown/.virtualenvs/ponder/local/lib/python2.7/site-packages/ponder-0.0.40-py2.7.egg/ponder/server/__init__.py", line 10, in <module>
from ponder.server.views import Endpoints, route
ImportError: No module named views


This works fine from a python REPL:

% python
Python 2.7.5+ (default, Feb 27 2014, 19:37:08)
[GCC 4.8.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from ponder.server.views import Endpoints, route
>>>


and from a command line import:

% python -c "from ponder.server.views import Endpoints, route"


An abridged
tree
output shows what I am working with:

% tree
├── __init__.py
├── ponder
│   ├── __init__.py
│   ├── server
│   │   ├── __init__.py
│   │   └── views
│   │   ├── environment_templates.py
│   │   ├── groups.py
│   │   ├── __init__.py
│   │   ├── instances.py
│   │   ├── tasks.py
│   │   └── users.py


My
PYTHONPATH
is set to the root of this tree:

% echo $PYTHONPATH
/home/hughdbrown/workspace/ept/ponder/lib


I am running this in a virtualenv that uses python 2.7. I have had this working off and on today but I can't figure out where the problem is. For one thing, the
__init__.py
seems to be okay with some imports that come just before:

from .database import get_db
from .config import parser
from .views import Endpoints, route


(I changed the last line to an absolute import. No luck.)

Things that I have tried:


  1. Rebuilding virtualenv

  2. Setting
    PYTHONPATH

  3. Using absolute paths in code

  4. Looking for circular imports



I am open to further suggestions in how to debug this error.




So the mistake I made was to look only at the source tree. The problem was really in the runtime environmment, in my virtualenv. And when I looked there, I found that the desired files were not being installed. The problem, at root, was the setup.py.

Answer

My usual trick is to simply print sys.path in the actual context where the import problem happens. In your case it'd seem that the place for the print is in /home/hughdbrown/.local/bin/pserve . Then check dirs & files in the places that path shows..