This looks like a toy project, not a “VERY difficult” problem like you stated.

What does that mean? Have you never worked on extremely difficult problems as a side project?

I guess my comment got lost in translation. The project OP linked in his comment is a toy project, not a difficult problem as he led others to believe.

So you could have done it in your sleep, with your hands tied behind your back. Got it.

(You may not realize it but simonw is one of the cofounders of Django, Python's web framework. If they find a Python problem difficult, it probably is.)