oh my

Instructions: "You can not use multiplier "*" operator."

I think this kata has been reviewed and its issues with Python addressed, because I found none of the problems that past users encountered. Thanks for the improvements!

Inside the lambda expression, on the right between parentheses (), it defines a tuple containing the original string s in the position 0. In position 1, it removes the last letter form the original string using the index s[]. On the left between brackets [] goes an expression that will act as the index of the tuple. If the original string does not end with an exclamation, the expresion s.endswith('!') will return a 0, selecting the value at position 0 of the tuple, so the lambda returns s. On the other hand, if the original string ends with an exclamation, the expression s.endswith('!') will return a 1, selecting the value at position 1 of the tuple, so the lambda returns s[]. This is basically control flow but using indexes instead of if-else expresions.

O___O

Oh, sorry! I thought these comments were only visible to users that had completed the kata. I'm trying to flag the spoiler but it says I'm not authorized to do so. I can't find a way to delete the comment either now, maybe due to your reply

It's just a bit of harmless flavour...

Didn't know about this, thanks!

0___________0

Neat! Never even thought about this

Am I the only one that finds this sort of one-line code unnecessarily messy?
Like, ok cool, it's in one line, but barely readable...

I guess the description has been massively improved after all the complaints. Now it's basically a matter of turning the formula into code while paying attention to the units, which is not a bad 8kyu exercise for beginners. Not the most interesting either, but still...