Pymacs (Documentation) allows you to write plugins for Emacs in Python.
Is it possible to write an Emacs plugin in PyMacs which displays graphics in an Emacs window (using one of the graphics libraries available for Python)?
Update 1: Here is the result of the minimal example:
In the upper right Emacs window, an ellipse, a rectangle and/or a line is displayed by code written, primarily, in Python.