Can you guys please give me some examples of mathematical programs using class in python ?

Answer 1

Your question looks like homework assignment. Here in SoloLearn you can find many examples. Try looking in the neural network lesson and in the Python lessons. Numpy and matplot are very common. For AI take a look at https://www.kdnuggets.com/2018/02/top-20-python-ai-machine-learning-open-source-projects.html

Answer 2

Off the top of my head, I don’t know any applications that are for math. But most applications will use some math. Blender is an open source 3D modeling program that uses math in many areas.
A lot of math is done through numpy. I’m assuming you’re asking because you want inspiration for your own.

Answer 3

Run this in Pydroid - it's a simple math learning program that uses oop:

https://code.sololearn.com/cpi4kzhQ8JDq/?ref=app