http://bpython-interpreter.org/
bpython is a fancy interface to the Python interpreter for Linux, BSD, OS X and Windows (with some work). bpython is released under the MIT License. It has the following (special) features:
- In-line syntax highlighting.
- Readline-like autocomplete with suggestions displayed as you type.
- Expected parameter list for any Python function.
- "Rewind" function to pop the last line of code from memory and re-evaluate.
- Send the code you've entered off to a pastebin.
- Save the code you've entered to a file.
- Auto-indentation.
- Python 3 support.
Have a look at the tool.
http://bpython-interpreter.org/screenshots/