Why is rstrip() not removing \n

Question

def fixData(lib):
        for bookData in lib:
            for dataElement in bookData:
                if dataelement.endswith("\n"):
                     dataElement.rstrip("\n")
        return lib

Answer 1

rstrip returns a new string, it does not mutate the existing string. So instead you could assign back over the string.

dataElement = dataElement.rstrip("\n")