programs that generate images

i have yet to see a single simple program in a common (comes builtin on major Linux distros) interpreted language that generates the pixels of an image and brings it up in its own window. i was most hoping for something in Python3.

edit 1:

ideally, i'd like to see Python code that actually does the pixel work, itself, instead of calling some library. or maybe the library, itself, if entirely coded in Python3 (no C/C++, that would be cheating). getting the image to display with some library commonly available for Python would be OK.