It looks like the interpreter is running Python 3.52 - I noticed because I tried to debug with f-strings, but they came out starting in 3.6. Is there a reason for relying on the older version?
Thanks!
Course: Grokking the Coding Interview: Patterns for Coding Questions - Learn Interactively
Lesson: Problem Challenge 1 - Grokking the Coding Interview: Patterns for Coding Questions