Qt Designer Tutorial. GUI Programming with Python: QT Edition - A very complete document about. This tutorial is aimed at beginners just starting out with PyQt/PySide and Qt Designer, it will cover very basic usage of PyQt in combination with Qt Designer.
QT designer also makes it very easy to add Python code to your project.
Qt Designer is the Qt tool for designing and building graphical user interfaces (GUIs) with Qt Widgets.
The tool itself is platform and programming language independent. So the following is a brief tutorial on how to go about creating your first semi-interesting application with Python & QT. For a quick tutorial on how to use Qt Designer, refer to A Quick Start to Qt Designer.