I tried increasing or decreasing the number by programming

#Generator that increases or decreases the value by size
def repeat_range(range_size, offset = 0):

	def repeat_gen():
		signed = 1
		i = -1

		while True:
			i += signed
			if i == 0 :
				signed = 1
			if i == range_size -1:
				signed = -1
			yield i + offset

	return repeat_gen()


#Create iterations 1 to 4
repeat4  = repeat_range(4, 1)

for i in range(10):
	print repeat4.next(),

1 2 3 4 3 2 1 2 3 4

Recommended Posts