An import is missing in the Python3's problem template

[eglyph]

This is quite a minor thing, but the Python3's problem template uses types annotations, however typing isn't imported.

Could you please add from typing import * somewhere before # @lc code=start in the Python's template?

[brent-moffit]

+1, there are a bunch of Python modules imported by default in the Leetcode runner so it would be helpful to have those in the file as well. Alternatively, a way to create a custom template for each language would allow users to resolve this issue.