def Prod( N ):
	cons = (yield)              # get cons
	yield                       # resume scheduler
	for i in range( N ):
		print( "prod" )
		yield cons              # execute next
	print( "end", "prod" )

def Cons( N ):
	prod = (yield)              # get prod
	yield                       # resume scheduler
	for i in range( N ):
		print( "cons" )
		yield prod              # execute next
	print( "end", "cons" )

def Scheduler():
	n = (yield)                 # starting coroutine
	while True:
		n = next( n )           # schedule coroutine

prod = Prod( 5 )
cons = Cons( 5 )
next( prod )                    # prime
prod.send( cons )               # send cons
next( cons )                    # prime
cons.send( prod )               # send prod

s = Scheduler();
next( s )                       # prime
try:
	s.send( prod )				# start cycle
except StopIteration:
	print( "scheduler stop" )
print( "stop" )

# Local Variables: #
# tab-width: 4 #
# compile-command: "python3.5 ProdCons.py" #
# End: #