Constructing the largest number possible by rearranging a list

Question

Say I have an array of positive whole integers; I\'d like to manipulate the order so that the concatenation of the resultant array is the largest number possible. For exampl

Answer 1

import itertools
def largestInt(a):
    b = list(itertools.permutations(a))
    c = []
    x = ""
    for i in xrange(len(b)):
        c.append(x.join(map(str, b[i])))
    return max(c)