import sys

# This, in case you didn't notice, is a comment.

def gcd(x, y):
  while x <> y:
    if x > y:     # This is another comment.
      print "x is bigger"
      x = x - y
                  # This comment doesn't imply any indentation.
    else:

      print "y is bigger"
      y = y - x
  return x

def go():
  for x, y in [(12,20), (37,18), (2, 54)]:
    print gcd\
      (x, y)