In my attempt to learn (Iron)Python out in the open, here’s my solution for Project Euler Problem 5. 

As always, any feedback is welcome.

# Euler 5
# http://projecteuler.net/index.php?section=problems&id=5
# 2520 is the smallest number that can be divided by each
# of the numbers from 1 to 10 without any remainder.
# What is the smallest positive number that is evenly
# divisible by all of the numbers from 1 to 20?
import time
start = time.time()

def gcd(a, b):
    while b:
        a, b = b, a % b
    return a

def lcm(a, b):
    return a * b // gcd(a, b)

print reduce(lcm, range(1, 20))

print "Elapsed Time:", (time.time() - start) * 1000, "millisecs"
a=raw_input('Press return to continue')