def lessThan(a, b):
    return a < b

def greaterThan(a, b:
    return a > b

def sort(lst, compFunc):
    for i in range(0, len(lst) - 1):
        for j in range(i + 1, len(lst)):
            if compFunc(lst[i], lst[j]):
                lst[i], lst[j] = lst[j], lst[i]

    return lst

sort([5, 2, -1, 3], lessThan) # returneaza -1 2 3 5 (sorteaza dupa regula a < b, adica crescator)
sort([5, 2, -1, 3], graterThan) # returneaza 5 3 2 -1 (sorteaza dupa regula a > b, adica descrescator)