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Okay, I finally was able to produce a small example. When I 
start python from the commandline with 
file "Lebenserwartung.py" python crashes. It doesn't crash 
when I remove the coding-line (1st line) of 
file "Sterbetafeln.py".

(The example can't run properly due to missing files, but 
these don't influence the crashes)

Best regards, Axel