[PyQt] How to clip layout to sides and bottom of main window?

[Valmont]

A simple window (QWidget) with a status bar. I add some kind of layout to insert a textbox and a few labels in a horizontal line-up. But how to I attach the layout - haven't decided yet which one - to the left, right and bottom of the window? So that if the window resizes or even maximizes, the layout always stays at the bottom or at least attacked to the sides? (Wasn't this called "clipping"?).

I thought for a second that maybe there's a QWidget Resize Signal which I could attach to some slot to resize the frame and repaint the the frame and its contents or something, but such a signal doesn't exist.