Switching windows in PyQT

[ShanMayne]

Greetings All

I am new to PyQT and GUI programming in general. What tutorials I have
found are relatively clear on standard operations within a single
window (QtGui.QWidget or QtGui.QMainWindow). Exiting this window exits
the overall application.

How would I switch between windows, that is close one and open
another, within a running application. I would imagine this to be a
standard feature often coded.

My thanks
Shannon