Resolving failure of "import __version__"

[John of NOVA]

Using the Python IDLE, I added the trac and genshi code from the /usr/lib/pythonVERSION/site-packages/ directory to the sys.path so I could modify a python script in order to create a custom plugin. That way the plugin I develop will be able to call upon the classes of trac.

I was able to do the following with no problem: from trac.core import Component, implements

However, when I did the following it fired off an error when it reached the line: from trac import __version__

So how do i resolve this?

>>> from trac.ticket.api import ITicketManipulator
Traceback (most recent call last):
  File "<pyshell#1>", line 1, in ?
    from trac.ticket.api import ITicketManipulator
  File "C:\Users\mcmahonjoh\Desktop\Python Project\trac\ticket\__init__.py", line 1, in ?
    from trac.ticket.api import *
  File "C:\Users\mcmahonjoh\Desktop\Python Project\trac\ticket\api.py", line 30, in ?
    from trac.wiki import IWikiSyntaxProvider, WikiParser
  File "C:\Users\mcmahonjoh\Desktop\Python Project\trac\wiki\__init__.py", line 1, in ?
    from trac.wiki.api import *
  File "C:\Users\mcmahonjoh\Desktop\Python Project\trac\wiki\api.py", line 28, in ?
    from trac.wiki.parser import WikiParser
  File "C:\Users\mcmahonjoh\Desktop\Python Project\trac\wiki\parser.py", line 24, in ?
    from trac.notification import EMAIL_LOOKALIKE_PATTERN
  File "C:\Users\mcmahonjoh\Desktop\Python Project\trac\notification.py", line 23, in ?
    from trac import __version__
ImportError: cannot import name __version__

[Olemis Lang]

Is setuptools (i.e. pkg_resources) installed ?

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[John of NOVA]

I did bring over the pk_resources.

I should mention I am developing the plugin on a Window's machine. I have python installed and brought over the trac and genshi installations from a CentOS VM I have running to simulate the system my trac modifications will be used on.

If I can only develop plugins in a Linux environment, then I'll just move my work over there.

[RjOllos]

I second the comment by Olemis. Can you run?:

import pkg_resources

If not, you need to install setuptools: http://pypi.python.org/pypi/setuptools

[Olemis Lang]

On 8/21/12, RjOllos <ry...@physiosonics.com> wrote:
> I second the comment by Olemis. Can you run?:
> import pkg_resources
>

from the command line this should look like

{{{
#!sh

$ X:\path\to\python.exe -c "import pkg_resources"

}}}

> If not, you need to install setuptools:
> http://pypi.python.org/pypi/setuptools
>

... and if it works then I have no clue ...
O.o

[John of NOVA]

It did work fine. But I guess I'll move my work to the CentOS VM to see if that resolve the problem then.

[Ethan Jucovy]

Maybe a silly question, but did you name your plugin trac.py (or trac/something.py)?  It looks like "from trac import [...]" might be finding the wrong file somehow.  What happens if you just run "import trac; print trac" from the command line?  Does it refer to the file C:\Users\mcmahonjoh\Desktop\Python Project\trac\__init__.py or something surprising?

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[John of NOVA]

The plugin is called required.py

It does reference C:\Users\mcmahonjoh\Desktop\Python Project\trac\__init__.py

This is what happens:

>>> import trac
>>> print trac
<module 'trac' from 'C:\Users\mcmahonjoh\Desktop\Python Project\trac\__init__.py'>

[Ethan Jucovy]

Hi John,

Did you manage to resolve this?  I just ran into a similar problem.  I haven't traced down exactly what's causing it, or how to reproduce it, but I was able to fix it by adding these two lines to the start of my plugin's Python file:

from pkg_resources import DistributionNotFound, get_distribution

from trac import __version__ as VERSION

It seems like some kind of circular import problem involving pkg_resources magic; by making sure that pkg_resources was imported before trac.__version__ I think the circular import is prevented.

-Ethan

To view this discussion on the web visit https://groups.google.com/d/msg/trac-users/-/M0GHRaAVyacJ.

[John of NOVA]

Never got it resolved. Just moved my workspace to a CentOS VM and continued work from there. Don't know how to get it working on Windows.