This is just some python code using sympy I used to solve, visualize, or verify, a few of the homework problems from EE102: Introduction to Signals & Systems, Stanford University, by Professor Stephen Boyd. It is an old course with lecture videos from 1999 available on Youtube here, (the audio from the videos was sometimes annoying, but it was nearly 100% intelligible). I found it quite good as an intro to to signals and systems, especially for electrical engineering, covering stuff like linear time invariant systems, the Laplace Transform, transfer functions, bode plots, stability analysis, and feedack.

The only solutions I have found for the homework problems are the ones linked to here, which only gives solutions for 33 out of the 113 exercises, but for a lot of the other exercises it was at least pretty clear if I was on the right track, and for some I could verify some or parts of the answers with sympy. It would of course have been nice to be able to have solutions for all exercises to be able to check for mistakes, etc, though.