Can you check my code and say what's wrong with it? It's from the sololearn exercise

Question

https://code.sololearn.com/cD3G6zPQdFXW/?ref=app

Answer 1

in your add function suddenly an object b appears? Maybe name the parameter b instead of capacity?

Answer 2

Timour Zinaliyev , can you please describe what kind of problem you encouter? The code runs without any error, and it seems also create the correct result. Only the output could be optimized by inserting some blancs.

Answer 3

Lisa is the best answer it's a question from the course of solo learn, if it runs it doesn't mean it is good