How to find the maximum digit of an integer?

Question

If the integer is 2013, then the maximum number would be 3.

How would I proceed to doing so?

Answer 1

max([int(c) for c in str(2013)])

First you convert the number to a string, this allows to look at every digit one by one, then you convert it into a list of single digits and look for the maximum.

Another solution is

max = -1

for c in str(2013):
    i = int(c)
    if i > max:
        max = i