Worksheet-based graphical Python shell

 Reinteract is a tool for interactive experimentation with Python
 oriented around "worksheets" containing Python code combined with the
 results of that code, formatted as text or graphical plots. Unlike a
 traditional shell, you can go back and edit previously entered
 statements, and the results will update.
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 Amongst other things, Reinteract is suitable for experimentation with
 the Python language and for data analysis using NumPy and SciPy.