Ranking_matematikk.net

from math import floor, ceil

b = 3
def func(a, x):
    return float(a*x**b)

def round_to(num, string='round', cutoff=0):
    try:
        1/float(cutoff)
    except:
        digits = len(str(int(floor(num))))
        cutoff = 5**(max(digits-1,1))
    if string == 'round':
        return int(cutoff*round(num/float(cutoff)))
    elif string == 'ceil':
        return int(cutoff*ceil(num/float(cutoff)))
    elif string == 'floor':
        return int(cutoff*floor(num/float(cutoff)))

def R(a, N):
    if N == 1:
        return 0
    return round_to(func(a, N+1))

def find_a(num):
    return max(round_to(num, 'floor'), 3500)/float(26**b)

if __name__ == '__main__':

    # Apner en tekstfil med gjeldende grenser og navn
    with open('grenser.txt') as f:
        mylist = [tuple(map(str, i.rstrip('\n').split(' '))) for i in f]

   # Bestemmer verdien av a, hvis femteplass > 3500.
    femte_plass = 3870
    a = find_a(femte_plass)

    for i, elem in enumerate(mylist):
        print elem[0], R(a, i+1)
    print "Tittel", R(a, (i+1)+1)