numList = list(range(1,101))
numList2 = list(range(1,201))

totalSum = 0
partialSumIndex = 0

selection = "0"

def gaussAdd(list):
	while len(list) > 0:
		intTwo = list.pop
		intOne = list.pop(0)
		intSum = intOne + intTwo
		totalSum += intSum
		partialSumIndex += 1
		print("%d + %d = %d" % (intOne, intTwo, intSum))
		print("%d will be added to the total." % intSum)
		print("The partial sum index has increased to %d." % partialSumIndex)
	print("The total sum of all numbers in the given list is %d." % totalSum)

while selection != 1 or 2:
	print("Choose a list to summarize using Gaussians additions.")
	selection = input("Type 1 for the 1-100 range, type 2 for the 1-200 range:")
	if selection == '1':
		gaussAdd(numList)
	elif selection == '2':
		gaussAdd(numList2)
	else:
		print("I'm sorry, that's not a valid option. Please enter 1 or 2.")