def get_leaderboard():
Users_reg = User.objects.all()
lst = ()
for user_reg in Users_reg:
uname = user_reg.username
score = get_expertise_lvl_rank(uname)
uname_str = str(uname)
lst = lst + ((uname_str, score),)
return sorted(list(lst), key=lambda element: element[1], reverse=True)