Hey,
I tried it again, it works without problems, my thinking was wrong, I thought I have to select the attributes in editor. Sorry for the confusion.
How to define a attribute is clear, I also have checked the tutorials 🙂 they helped me a lot, not only with this problem. The problem is that I cannot make a string "rand (20,50)"...
The answer for the ":" problem is enough, thank you, I don´t have much Python scripting experience, but that´s my problem 🙂
I only want to know how it works, now I can try.
Thanks again for your time.