gistfile1.txt

import unittest

NUMB = str(7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450)

def prod_of_big_number(number, n):
    """Takes a string and returns the max possible product of consecutive digits (digits) in
    that string."""
    min_index = 0
    max_index = min_index + n
    high_num = 0
    while max_index <= len(number):
        #check for zeros to save some computation
        zero_flag = number[min_index:max_index].rfind('0')
        if zero_flag >= 0:
            min_index = min_index + zero_flag + 1
            max_index = min_index+n
            continue
        #obtaining the reduced product
        curr_num = 1
        for x in number[min_index:max_index]:
            curr_num *= int(x)
        #store high result
        if curr_num > high_num:
            high_num = curr_num
        min_index += 1
        max_index += 1
    return high_num

class AdjacentProductTestCase(unittest.TestCase):

    def test_4_digits(self):
        self.assertEqual(prod_of_big_number(NUMB, 4), 5832)

    def test_5_digits(self):
        self.assertEqual(prod_of_big_number(NUMB, 5), 40824)

    def test_13_digits(self):
        self.assertEqual(prod_of_big_number(NUMB, 13), 23514624000)


unittest.main()