DreamPie is a Python shell which is designed to be reliable and fun. It is licensed under GPLv3.
For more information, take a look at http://www.dreampie.org/
To run, you will need Python 2.6 or 2.7, and PyGTK with pygtksourceview.
You can simply run dreampie.py or dreampie. Or, if you wish:
On Mac and Linux, run
ln -s dreampie /usr/local/bin
DreamPie can use just about any Python interpreter (Jython, IronPython, PyPy). You can give as it an argument with the name of the interpreter:
./dreampie python3
./dreampie /path/to/pypy