I am completely lost, this made be just me being stupid but I have no idea what to do. For some reason the topn is an unresolved reference. [1]: https://i.stack.imgur.com/hKtNs.png [2]: https://i.stack.imgur.com/aB4T8.png
The code is:
topn = ""
print(topn)
def addApp():
topn = topn + "1"