Tests do not necessarily test for "-1" being the coefficient of the term with the highest power of the variable (e.g. the x^3 coefficient of (-x+1)^3 is -1). In this case, my original code would have returned -1x^3 + ..., yet it passed because this case was not tested (I ran it again because I removed some print() statements, and then it failed).
Brilliant kata, though—thanks!

You seem to be checking the whole word, but the instructions only want you to check the first letter of every word.

Thanks for the feedback! I can't seem to edit the test cases, though.

Thanks for the feedback; I'm glad you enjoyed it! And good luck with your programming in the future!

Approved, thanks!

I'm not sure how they know, but I have approved it.

Hello! Thanks for bringing this up; I think I've changed it. If you have any more feedback about this Kata, I'd be grateful!

Thanks for the feedback! I've changed the description to include something about the number for spaces between words. What do you think about it now?

The instructions say the first letter of each word. I believe you're checking every letter of every word.

As has been said-the object-oriented Python programming may confuse newer programmers.

Oops, I glossed over thar-thanks!

Thanks! I've changed it to strng.