NoneType object is not subscriptable

Question

I am working on a seven-segment display project on Learnstreet. One of the required methods takes the input obtained from a text box which is labelled \"inputString\". Input Str

Answer 1

One of the other requirements is to return something. Since your function returns nothing, None is implicitly returned, and this causes the test scaffolding to fail. Perhaps you should return a list containing the return values of each invocation of illuminate().