def Fib():
	def Refactor():
		nonlocal fn, fn1
		fn = 0;	fn1 = fn
		yield fn						# suspend

	def Refactor2():
		nonlocal fn, fn1, fn2
		fn = 1; fn2 = fn1; fn1 = fn
		yield fn						# suspend

	yield from Refactor()
	yield from Refactor2()
	while True:
		fn = fn1 + fn2; fn2 = fn1; fn1 = fn; yield fn

f1 = Fib()
f2 = Fib()
for i in range( 10 ):
	print( next( f1 ), next( f2 ) )		# resume

# Local Variables: #
# tab-width: 4 #
# compile-command: "python3.7 FibRefactor.py" #
# End: #