Finding the LCM of a range of numbers

Question

I read an interesting DailyWTF post today, \"Out of All The Possible Answers...\" and it interested me enough to dig up the original forum post where it was submitted. This

Answer 1

This is probably the cleanest, shortest answer (both in terms of lines of code) that I've seen so far.

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

n = 1
for i in xrange(1, 21):
    n = lcm(n, i)

source : http://www.s-anand.net/euler.html