the little ( ugly ) pycrawl_walkdemo.py works fine now. The player ( an @ ) can be moved around and he does not walk through walls anymore.
It's also possible to see a detailed description of the tile where the player stands and a list of possible actions. ( You can only look at the list at the moment, i still have to code the actions).
Next step: to make little demos for shopping, fighting, traps and treasure boxes.