Circular import problem

Gabriel Genellina gagsl-py2 at yahoo.com.ar
Fri Jul 13 05:08:06 CEST 2007


En Thu, 12 Jul 2007 23:36:16 -0300, bvdp <bob at mellowood.ca> escribió:

> I'm going quite nutty here with an import problem. I've got a fairly
> complicated program (about 12,000 lines in 34 modules). I just made
> some "improvements" and get the following error:
>
> bob$ mma
> Traceback (most recent call last):
>   File "/usr/local/bin/mma", line 55, in <module>
>     import MMA.main
>   File "/usr/local/share/mma/MMA/main.py", line 33, in <module>
>     import MMA.docs
>   File "/usr/local/share/mma/MMA/docs.py", line 34, in <module>
>     import MMA.grooves
>   File "/usr/local/share/mma/MMA/grooves.py", line 41, in <module>
>     import MMA.auto
>   File "/usr/local/share/mma/MMA/auto.py", line 35, in <module>
>     import MMA.parse
>   File "/usr/local/share/mma/MMA/parse.py", line 2052, in <module>
>     'AUTHOR':           MMA.docs.docAuthor,
> AttributeError: 'module' object has no attribute 'docs'
>
> I can fix this by deleting a line in docs.py. Just take out the
> "import MMA.grooves" and all works. What I really don't get is that in
> the middle of this module which is now NOT loading "grooves.py" I have
> a command to access a function in that module and it works.
>
> Yes, grooves.py has an import docs.py. And there are lots of other
> such imports in the program.
>
> So, I have to assume that the error is being generated by some other
> modules loading in the grooves.py stuff ... but  really have no idea.
>
> Is there anything I can do to trace though this and get it working
> properly?

See http://effbot.org/zone/import-confusion.htm
Try to move the circular references later in the code (maybe inside a  
function, when it is required), or much better, refactor it so there is no  
circularity.

-- 
Gabriel Genellina




More information about the Python-list mailing list