• raised as an issue above
• the list of installed Python packages on Codewars is here. If a package is not listed there it is not available. You can request new packages here.

Could you please amend the 'Notes' or 'Good to know' to mention:

• Polynomial terms whose coefficients are explicitly zero should be mentioned in the output, for example the input polynomial '58x^13-70x^10+0x^9' should return '754x^12-700x^9+0x^8' and not just '754x^12-700x^9'

• The SymPy library cannot be imported

The description is too vague to be useful and needs to be clarified.

You are right. Tried with profiler on long ints (10k-5m digits) - the most time consuming operation inevitably is building the result and your way (from string) is way faster.

Just realized that int operations is not O(1) anymore when python unlimited ints is involved.

Why not just run: max([j for j in v if (j - int(j))==0]) ? Or am I missing something?