bpython is a fancy interface to the Python interpreter for Unix-like operating systems.
bpython is a fancy interface to the Python interpreter for Unix-like operating systems (I hear it works fine on OS X). It is released under the MIT License. It has the following 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.
(Source: http://bpython-interpreter.org/)