matplotlib - Unable to catch RuntimeError in python -

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i writing python 2.7 plotting script using matplotlib , want display plotted, unless run non-x session on institute server batch-plotting. such cases tell not display anything.

however don't want stop if forget doing that, why i'm trying catch runtimeerror exception so:

try:     pyplot.show() except runtimeerror:     print 'could not display figure. no x-session?' except:     print 'unexpected error:'     raise

doing this, however, still i'd without trying catch anything, namely traceback and:

runtimeerror: invalid display variable

it doesn't print 'unexpected error', doesn't run second except.

what missing? might simple because i'm rather new this.

edit:

the exception seems thrown before try display plot, maybe different problem altogether.

the problem somewhere else altogether. hava use different backend matplotlib if i'm running non-x session. checking display-variable cel suggested , calling

matplotlib.use('agg')

on non-x sessions before importing pyplot solves problem.


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