[Qgis-user] Python error

[John C. Tull]

On Jan 14, 2009, at 9:55 AM, Bernardo Rossi Doria wrote:

> hello all
> downloaded and installed qgis 1.0 osx  after I deleted previous  
> version on macbook pro
>
> When I open the app  a Python error comes out with this description.
> Couldn't load plugin "newlayer" from
>  ['/Applications/qgis-1.0.0/qgis1.0.0.app/Contents/MacOS/share/qgis/ 
> python', '/Users/bernardo/.qgis//python/plugins', '/Applications/ 
> qgis-1.0.0/qgis1.0.0.app/Contents/MacOS/share/qgis/python/plugins',  
> '/Library/Python/2.5/site-packages/GDAL-1.5.2-py2.5-macosx-10.5- 
> i386.egg', '/System/Library/Frameworks/Python.framework/Versions/2.5/ 
> lib/python25.zip', '/System/Library/Frameworks/Python.framework/ 
> Versions/2.5/lib/python2.5', '/System/Library/Frameworks/ 
> Python.framework/Versions/2.5/lib/python2.5/plat-darwin', '/System/ 
> Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/plat- 
> mac', '/System/Library/Frameworks/Python.framework/Versions/2.5/lib/ 
> python2.5/plat-mac/lib-scriptpackages', '/System/Library/Frameworks/ 
> Python.framework/Versions/2.5/Extras/lib/python', '/System/Library/ 
> Frameworks/Python.framework/Versions/2.5/lib/python2.5/lib-tk', '/ 
> System/Library/Frameworks/Python.framework/Versions/2.5/lib/ 
> python2.5/lib-dynload', '/Library/Python/2.5/site-packages', '/Users/ 
> bernardo/.qgis/python/plugins/fTools_preview2/tools']
>
> Traceback (most recent call last):
>   File "", line 2, in
>   File "/Users/bernardo/.qgis//python/plugins/newlayer/__init__.py",  
> line 2, in
>     from newlayer import NewLayer
>   File "/Users/bernardo/.qgis//python/plugins/newlayer/newlayer.py",  
> line 5, in
>     import psycopg
> ImportError: No module named psycopg
>
> Versione Python:
> 2.5.1 (r251:54863, Jan 17 2008, 19:35:17)
> [GCC 4.0.1 (Apple Inc. build 5465)]
>
>
>  If I click OK the application freezes
> So I deleted in  Application /contents       the PyQt4 folder  
> content and then it says : "Impossibile caricare PyQt4.
> Il supporto Python verrà disabilitato."  but opens and  works fine  
> with other plugins.
>
> What is wrong with PyQt4?
>

I don't think anything is wrong with PyQt4. Instead of deleting  
necessary items from the application bundle, you need to delete your  
incompatible plugin. From the terminal do:

rm -r /Users/bernardo/.qgis/python/plugins/newlayer

That will take care of the offending plugin. You may have others, in  
which case, doing:

rm -r /Users/bernardo/.qgis/python/plugins

is probably preferable (start with a clean slate for the new API in  
1.0.0).

You also need to reinstall your qgis application because you need  
everything inside the application bundle. Deleting things from there  
will break it every time.

Regards,
John