Awful description, I was like WTF?

Is this a GNU extension?

I thought this would cause an IndexError or something?

Hi! What does [[1]] mean please?

So you don't have to convert string literal into std::string?

I got this error "-bash: -1: substring expression < 0", how?

Some(f) if f == &find => return iter.next().cloned(),
I thought iter.next() returns Option<&T> instead of Option T. Does .cloned() turns <&T> into T>?

Maybe constructor != initialize (cuz in c++ it returns a new object or something I'm not sure cuz I use python)

Oh... I finished this kata using py3 and returned a filter object and it worked

I thought filter() would return a filter object instead of a list?

This is what I thought: if matched a invalid char then it means u have to return false.

only 996