If I was evaluating your code for production standard, then no testing is automatic failure. I assume you didn't run python formatter like black. Some of the codes aren't my personal style, but I won't deduct any points for that.

Take-home exam is bullshit in my opinion. I've done total of 3 in my career, and nothing came out of it. Zero feedback other than you are not what we are looking for. I've long since declined about any take home exams. I rather leetcode than take home because leetcode can scale, while take home is just unpaid work.