If we write anything about this page in .py file?

yes, you should define at least fileds you need in .py file

The fields only...? Actually i want the notebook for adding team(Like in Project}

that would be many2many field... define it in your .py, and show it in view...

I tried it,But it shows the following error.. AssertionError: Did not expect element notebook there, line 838

in order to give advice someone should see your code ... we are not wizzards or foreseers :) ...