euler8.py

from operator import mul
def euler8(digits, n=4):
    i = 0
    _max = 0
    while i <= len(digits)-n:
        _r = reduce(mul, [int(x) for x in digits[i:i+n]])
        if _r > _max:
            _max = _r

        i += 1
    print '>'
    print _max
    print '<'

euler8("12345678910")
d = "73167176531330624919225119674426574742355349194934"
d += "96983520312774506326239578318016984801869478851843"
d += "85861560789112949495459501737958331952853208805511"
d += "12540698747158523863050715693290963295227443043557"
d += "66896648950445244523161731856403098711121722383113"
d += "62229893423380308135336276614282806444486645238749"
d += "30358907296290491560440772390713810515859307960866"
d += "70172427121883998797908792274921901699720888093776"
d += "65727333001053367881220235421809751254540594752243"
d += "52584907711670556013604839586446706324415722155397"
d += "53697817977846174064955149290862569321978468622482"
d += "83972241375657056057490261407972968652414535100474"
d += "82166370484403199890008895243450658541227588666881"
d += "16427171479924442928230863465674813919123162824586"
d += "17866458359124566529476545682848912883142607690042"
d += "24219022671055626321111109370544217506941658960408"
d += "07198403850962455444362981230987879927244284909188"
d += "84580156166097919133875499200524063689912560717606"
d += "05886116467109405077541002256983155200055935729725"
d += "71636269561882670428252483600823257530420752963450"
euler8(d, n=13)