Development of the Python/tk Widgets for the Control System Based on Epics

During the commissioning of accelerators, many application programs are built and some of them are scrapped every day. Quick development of a large amount of application software and keeping their quality high are essential for the efficient operation and machine studies of the accelerators. Especially, to construct excellent GUI (graphical user interface) is key technology. EPICS (Experimental Physics and Industrial Control System) has several graphical editors to develop GUI. Although they are easy to use, they are not so flexible to use customized widgets. On the other hand, development of GUI by programming languages provides full flexibility. Python is a simple but powerful programming language suitable for the quick development of the application programs. Combining Python with Tcl/Tk widget set is one of the most powerful tools. In KEKB accelerators control system, several widgets for controls have been developed. They are not only for EPICS, but also general purpose. Using object-oriented feature of Python, these widgets have been easily customized for EPICS. Not only these widgets are presented, but the framework of the development of them is also discussed.