Nikos Alexandris wrote:
> > In a Python script, I use the following pygrass method to retrieve a list
> > of>
> > raster maps:
> > from grass.pygrass.gis import Mapset
> > ..
> > landsat_imagery = dict()
> > ..
> > landsat_imagery['Spectral Bands'] = Mapset().glist('rast', pattern =
> >
> > 'B[123457]')
> >
> > However, whenever the result is empty, i.e. there are no B1, B2 and so on
> >
> > named raster maps, running the script fails with the error:
> > landsat_imagery['Spectral Bands'] = Mapset().glist('rast', pattern =
> >
> > 'B[123457]')
> >
> > TypeError: 'str' object is not callable
> >
> > Running the instructions step-wise, from within ipython, doesn't appear to
> > be problematic. What am I missing in this case?
Moritz Lennert wrote:
> I can't reproduce this:
> >>> landsat_imagery = dict()
> >>> landsat_imagery
>
> {}
>
> >>> Mapset().glist('rast', pattern = 'B[123457]')
>
> []
>
> >>> landsat_imagery['Spectral Bands'] = Mapset().glist('rast', pattern
>
> = 'B[123457]')
>
> >>> landsat_imagery
>
> {'Spectral Bands': []}
>
> So even with an empty result of the glist call, I don't get an error
> message.
Right! I committed a classical beginner's mistake, that is right after
importing
from grass.pygrass.gis import Mapset
I used "Mapset", (outside of the function in which I used the above mentioned
code) as
gisenv = grass.gisenv()
Mapset = gisenv['MAPSET']
This naturally lead to the reported error. I found the question
<http://stackoverflow.com/q/10775541/1172302> to be helpful.
Thanks, Nikos
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