In my attempt to learn (Iron)Python out in the open, here’s my solution for Project Euler Problem 20.

As always, any feedback is welcome.

# Euler 20 # http://projecteuler.net/index.php?section=problems&id=20 # n! means n x (n - 1) x ... x 3 x 2 x 1 # Find the sum of digits in 100! import time start = time.time() def factorial(n): if n == 0: return 1 else: return n * factorial(n-1) print sum([int(i) for i in str(factorial(100))]) print "Elapsed Time:", (time.time() - start) * 1000, "millisecs" a=raw_input('Press return to continue')

Isn’t the sum of the digits in 100 = 1 + 0 + 0 = 1?????

Pretty much word-for-word exactly the same as my solution.

Wait until you get to the second page of problems, that’s when they *really* start getting difficult 🙂