Also, for lists it returns True if not and empty list

Seeing that you don't get any reply in 7 months, probably means it's not the right place. You might have better chances if you ask in Codewars's Discord Server instead.

This means exactly: "When multiple hashtag occurrences are found, delete only the first." ;)

You're doing recursion wrong.

Does not work how?

Did you read the FAQ? https://docs.codewars.com/training/troubleshooting/

java 8 in action.

keep trying. And try to convert some of your older solution to this "style". But keep in mind it's not always appropriate.

simply read my code ... now, keep staring at it until you understand it... there you go! Now you just learned how to do this too ;-)

It's unfortunately not possible directly. Profile picture is grabbed from yout GitHub account (if linked), or from Twitter account (if linked).

You can read some details (but not much) here.

Yes, and such a kind of identifier is not flagged as unused declared variable by linters.

In interactive/console mode, yes, _ is the last evaluated expression. But that's a different context.

Possibly (not that I fully understand what you mean), for .. in requires valid identifier (and _ is such) to bind each element of traversed generator to, additionaly _ is commonly used to denote that identifier is syntactically required here but not used anywhere (wildcard pattern).

if result: is the same as writing if result == True: if checks the validity of the condition.

Done.