How to configure crontab python @boot

i want to execute a python script at the @boot of the system.
i’m using the simulatore for the test, i tried to configure crontab with this sintax @boot python /home/ur/ursim/pippo.py &
but nothing. how could i do?

ps:…
i now i can see the proces running using (htop in terminal) but it don’t work properly.
the python that i want to start is a server. if i start manually with python path/path/path/pippo.py it works.
but if i start with the crontab it don’t works

Isnt it @reboot you need to use?