Opax you were right. I didn´t leave a space after 'python'
after typing in again only this time right: python /opt/rtap/main.py a got following message back:

Traceback (most recent call last):
File "/opt/rtap/main.py", line 6, in <module>
import graphe
File "/opt/rtap/graphe.py", line 8 in <module>
from PyQt4.QtMobility.QtBearer import *
ImportError: No module named QtNetwork

Any ideas?
Thanks