PyQT child forms

[daved170]

Hi everybody,
I'm building my GUI app with PyQT and i'm quite new with it.
I looked for example for managing a form and a child form.
My goal is to run the main form and a certain button will open a child
form. Whenever the child form will be open the main form will be
disabled until the child form is closed.
Moreover I would like to know how to pass data from the child form to
the main form.
Thank you very much
DaveD