IPython provides a replacement for the interactive python (Python)
interpreter with extra functionality.

Main features:

* Comprehensive object introspection.

* Input history that is persistent across sessions.

* Caching of output results during a session with automatically
generated references.

* Readline-based name completion.

* Extensible system of 'magic' commands for controlling the
environment and performing many tasks related either to IPython
or the operating system.

* Configuration system with easy switching between different setups
(simpler than changing $PYTHONSTARTUP environment variables every
time).

* Session logging and reloading.

* Extensible syntax processing for special purpose situations.

* Access to the system shell with user-extensible alias system.

* Easily embeddable in other Python programs.

* Integrated access to the pdb debugger and the Python profiler.