Item creator 

This is my first piece of code (together with tables.py). It is used to create new items and save them to the database. Have to say it doesn't work completely yet, but it is a nice start.

The problems:
The error handling sort of works, but after some wrong input and it loops back, it sees the new input as wrong (even if it is right). So after the first mistake, you kinda get stuck.

Further I plan to put the functions into a class, but I got some problems with the syntax so far.

If you have some tips, hints or suggestions, please say them.