Re: ncarg problem when attempting to import Nio

Hi,

Rather than specifying the directories for PyNGL and PyNIO directly, it looks as if you need to specify the path for the site-packages directory. Try:

sys.path.append('/usr/lib/python2.6/site-packages')

Normally I would expect that this would be part of sys.path by default, but apparently not in your case. Anyway PyNIO is looking for a subdirectory of one the sys.path elements named PyNIO/ncarg. Hope this helps.
 -dave

On Dec 14, 2010, at 4:54 PM, Jshgwave wrote:

>
> We installed the binaries for PyNGL and PyNIO on a 64-bit Debian Linux system.
>
> Whenever I try to import Nio by following the example on the page
> http://www.pyngl.ucar.edu/Nio.shtml,
> the importing fails because ncarg is not found.
>
> ncarg is not found even when sys.path.append is used to point to folders that contain ncarg,
> as is illustrated by the following session:
>
> midat:/home/hornstein> python2.6
> Python 2.6.6 (r266:84292, Nov 28 2010, 18:42:58)
> [GCC 4.4.5] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import sys
> >>> import numpy as np
> >>> sys.path.append('/usr/lib/python2.6/site-packages/PyNGL')
> >>> sys.path.append('/usr/lib/python2.6/site-packages/PyNIO')
> >>> sys.path
>
> ['', '/usr/lib/python2.6', '/usr/lib/python2.6/plat-linux2', '/usr/lib/python2.6/lib-tk', '/usr/lib/python2.6/lib-old', '/usr/lib/python2.6/lib-dynload', '/usr/local/lib/python2.6/dist-packages', '/usr/lib/python2.6/dist-packages', '/usr/lib/pymodules/python2.6', '/usr/lib/python2.6/site-packages/PyNGL', '/usr/lib/python2.6/site-packages/PyNIO']
>
> >>> # The last-named folder includes the files Nio.py and Nio.pyc.
> ... import Nio
>
> No path found to PyNIO/ncarg data directory and no usable NCARG installation found
> midat:/home/hornstein>
>
> As the last line shows, the failure to find ncarg always catapults me out of Python.
>
>
> The following shows the two locations that contain folders named "ncarg":
>
> midat:/home/hornstein> ls /usr/lib/python2.6/site-packages/PyNIO
> alt-setup.py coordsel.pyc ncarg nio.so _xarray.py
> alt-setup.pyc __init__.py Nio.py pynio_version.py _xarray.pyc
> coordsel.py __init__.pyc Nio.pyc pynio_version.pyc
>
> midat:/home/hornstein> ls /usr/lib/python2.6/site-packages/PyNGL
> fplib.so hlu.pyc __init__.py ncarg Ngl.pyc pyngl_version.pyc
> hlu.py _hlu.so __init__.pyc Ngl.py pyngl_version.py
>
>
>
> The ncarg subfolders in the PyNIO and PyNGL folders contain completely different sub-subfolders:
>
> midat:/home/hornstein> ls /usr/lib/python2.6/site-packages/PyNIO/ncarg
> grib2_codetables
>
> midat:/home/hornstein> ls /usr/lib/python2.6/site-packages/PyNGL/ncarg
> colormaps data database fontcaps graphcaps pynglex sysresfile
>
>
> By repeating the python session without any of the lines that pertain to PyNGL, I have verified that the difference between these two versions of the ncarg folder is not the problem.
>
> Thanks for your help.
>
>
> _______________________________________________
> pyngl-talk mailing list
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/pyngl-talk

_______________________________________________
pyngl-talk mailing list
List instructions, subscriber options, unsubscribe:
http://mailman.ucar.edu/mailman/listinfo/pyngl-talk
Received on Tue Dec 14 17:33:26 2010