First time here? We are a friendly community of Power Systems Engineers. Check out the FAQ!
The following script goes through all cases in working directory and writes the error codes from API FDNS and SOLVED to a text file.
import glob
with open('cases_solved.txt','w') as f:
for file in glob.glob('*.sav'):
psspy.case(file)
f.write('%s \t%s \t%s\n' %(file,psspy.fdns(),psspy.solved()))