I tried this the first time and it didn't work. shouted the old man shaking fist at cloud

nice and clear what your list interpration is doing.

What branch of math is number progresion taught in? Can anyone recomend some good resources?

need to clean this up

I like one liners but how did You get there I drew the triangle then calulated the values? to arrive the the same solution.
first I tried looking at the indexes in a list, went no where.

how long did your code take to run? I used a while loop and it was 2500ms

yes that's the kata convert 0 to o.... What I dont understand is why it runs in python on the raspberry pi and on codecademy

I don't understand I've ran my solution in codecademy's editor and runs fine, in the kata stays l0nd0n should equal london