Yup.

Well, then the OP there should be slapped for not telling the actual reason and instead just throwing a complaint without a cause.

What troubles you about it?

it's inefficient on long inputs. ;)

kudoos for not importing like nearly everyone else

The code is short, clear and it works. What troubles you about it?

It does work - it passes the Kata tests. The Kata description could probably have been more explicit taht the string will only contain the characters '(){}[]'.

Thank you for explaining, jolaf, I think the stack concept is going to come in handy when keeping track of things that can be thought of as pairs. The dictionary pairings was a 'key' insight as well. I'm thinking this might work for higher order tuples as well. Its like counting sets, where once you have a complete set, you throw(pop) them away. Could perhaps do a left-append and left-pop as well when there are 4 of a kind. Though it probably is better to switch to an table or something like that for more complex accounting.

not stack returns True if stack is empty.

That should be the case at the end of the function if braces are set correctly.

In general, it works like this:

• Iterate over character in the string.
• If we encounter an opening brace, put the respective closing brace to the top of the stack.
• If we encounter the closing brace, make sure it's equal to the one at the top of the stack.
• If that not the case, it means the braces order is incorrect and we should return False.
• At the end, the stack should be empty (otherwise it means some open brace was not properly closed).

Anyone want to explain how this is working? I get lost at "elif not stack or stack.pop() != b:" and I don't get how "not stack" returns True

Either you were being ironic when you all voted this up, or you are a Drumpf voter and have a loose grip on reality

adding arguements seems like cheating to me

So a list of lists can still be indexed as if it was a flat list??

Almost a triangle; I thought it was an art project; maybe codewars is becoming an artistic ai

Best documentation award