Getting processing errors

[michaelaye]

Is there a way to get the original error message from a ProcessError?
So far I only get this:

---------------------------------------------------------------------------
ProcessError                              Traceback (most recent call last)
<ipython-input-24-66f5816a1e13> in <module>()
----> 1 process_fname(merged.fpath.iloc[0])

/Users/klay6683/Dropbox/src/p4terrains/CTX_processing/calibration.py in process_fname(fname, get_name_only, keep_all, overwrite)
     25     print('making ISIS cub')
     26     stdout.flush()
---> 27     mroctx2isis(from_=fname, to=cub_name)
     28     print('spice init')
     29     stdout.flush()

/Users/klay6683/miniconda3/lib/python3.4/site-packages/pysis-0.5.1-py3.4.egg/pysis/isiscommand.py in __call__(self, **kwargs)
     55 
     56     def __call__(self, **kwargs):
---> 57         return self.call(**kwargs)
     58 
     59 

/Users/klay6683/miniconda3/lib/python3.4/site-packages/pysis-0.5.1-py3.4.egg/pysis/isiscommand.py in call(self, **kwargs)
     47         retcode = process.poll()
     48         if retcode:
---> 49             raise ProcessError(retcode, cmd, stdout=output, stderr=err)
     50 
     51         return output

ProcessError: Command '/Volumes/Data/Applications/ISIS3/isis/bin/mroctx2isis' returned non-zero exit status 4

Would be good if the causing problem could be caught in Python somehow. In this case it was:

mroctx2isis: Importing
**I/O ERROR** Cannot read file [./D14_032666_0916_XN_88S350W.IMG]. Position [19121830]. Byte 
count [5000].

[wtolson]

Yep, the stdout and stderr of the process is attached to the exception thrown. You can do something similar to this to print them out:

try:
    mroctx2isis(from_=fname, to=cub_name)
except ProcessError as error:
    print(error.stdout)
    print(error.stderr)

[michaelaye]

Thanks!

[michaelaye]

Should I add this to the readme maybe?

[wtolson]

Yeah, that would be really nice to have in the readme.