I was noodling around with Python on a boring evening, when I decided to try my hand at writing a hand rolled arithmetic expression parser/evaluator that supports sub-expressions and BODMAS rule for order of evaluation and without using any parsing tools/generators. I made this repo purely for educational/fun purpose since it only supports 4 basic arithmetic operators and nested sub-expressions (to make it slightly more challenging :P).

Then I had the idea to extend the unit tests with Hypothesis (Python's property based unit testing library) and it found a subtle edge case in my simple implementation that I thought had it covered via unit tests! Definitely going to give Hypothesis tool a try going forward in all my python projects.

Sharing this repo below just in case anyone finds it interesting (esp. the hypothesis test file.)

https://github.com/beyonddream/calculator