IDLE - Python IDE with the tkinter GUI toolkit

IDLE is the Python IDE built with the tkinter GUI toolkit. It is bundled in each release of the programming tool since 2.3. It is not included in the python package included with many Linux distributions. Its features include

• coded in 100% pure Python, using the tkinter GUI toolkit
• cross-platform: works on Windows and Unix
• multi-window text editor with multiple undo, Python colorizing and many other features, e.g. smart indent and call tips
• Python shell window (a.k.a. interactive interpreter)
• debugger (not complete, but you can set breakpoints, view and step)