Hello. You can sort an array, then map the array, and finally join the array.

The code is going to be something like this:

users = [("username", 5), ("someone", 15), ('n00b', 0)]

# Sort user array
users.sort(key=lambda a: a[1], reverse=True)

# Format the users
leaderboard = map(lambda user: user[0] + "| " + str(user[1]), users)

# Output
print("\n".join(leaderboard))

Hopes this helps!