bitList.py

def bitList2(x, y):
	output = []
	assert isinstance(x, int) and isinstance(y, int), "not integer"
	assert x>0 and y>0, "number is not positive"
	assert x < y, "the input should be switched"
	if x == 1:
		output.append(2)
	else:
		output.append(4*(2**(x-2)))
	for i in range(x+1, y+1):
		output.append(3*(2**(i-2)))
		output.append(4*(2**(i-2)))
	return output

def bitList3(x, y):
	output = []
	assert isinstance(x, int) and isinstance(y, int), "not integer"
	assert x>0 and y>0, "number is not positive"
	assert x < y, "the input should be switched"
	if x == 1:
		output.append(2)
		output.append(3)
		output.append(4)
	elif x == 2:
		output.append(4)
	else:
		output.append(8*(2**(x-3)))
	if x != 1:
		for i in range(x+1, y+1):
			output.append(5*(2**(i-3)))
			output.append(6*(2**(i-3)))
			output.append(7*(2**(i-3)))
			output.append(8*(2**(i-3)))
	else:
		for i in range(3, y+1):
			output.append(5*(2**(i-3)))
			output.append(6*(2**(i-3)))
			output.append(7*(2**(i-3)))
		output.append(8*(2**(i-3)))
	return output