Illustration of Python generators

gistfile1.py

# Illustration of Python generators

def count_down(size):
  print "starting generation"
  while size > 1:
    print "yielding"
    yield size
    size -= 1
  print "finishing generation"
  yield size

if __name__ == "__main__":
  print "start"
  gen = count_down(3)
  print "next = " + str(next(gen))
  print "next = " + str(next(gen))
  print "next = " + str(next(gen))
  print "stop"

# start
# starting generation
# yielding
# next = 3
# yielding
# next = 2
# finishing generation
# next = 1
# stop