Python Calculator that accepts multiple inputs from a user

Python Calculator.py

#Creating a calculator that gets multiple input from the user
from functools import reduce

def addition(*args):
    newList = []
    for i in inputList:
        z = int(i)
        newList.append(z)
    NumbersSum = sum(newList)
    return NumbersSum


def subtraction(*args):
    newList = []
    for i in inputList:
        z = int(i)
        newList.append(z)
    NumbersSub = newList[0] - sum(newList[1:])
    return NumbersSub

def multiplication(*args):
    newList = []
    for i in inputList:
        z = int(i)
        newList.append(z)
    NumbersMult = reduce(lambda x, y: x*y, newList)
    return NumbersMult

def division(*args):
    newList = []
    for i in inputList:
        z = int(i)
        newList.append(z)
    NumbersDiv = reduce(lambda x, y: x/y, newList)
    return NumbersDiv

print("Please enter your choice\n" +
      "1 -> Addition\n" +
      "2 -> Subtraction\n" +
      "3 -> Multiplication\n" +
      "4 -> Division\n")

choice = int(input("Enter your choice: "))
if 1 <= choice <= 4:
    print("Please enter your values: ")
    inputList = input().split()
    #print(inputList)


    if choice == 1:
        varList = addition(inputList)
        print("The sum of your inputs is: ", varList)
    elif choice == 2:
        varList = subtraction(inputList)
        print("The difference of you inputs is: ", varList)
    elif choice == 3:
        varList = multiplication(inputList)
        print("The product of your inputs is: ", varList)
    elif choice == 4:
        varList = division(inputList)
        print("The quotient of your inputs is: ", varList)
else:
    not_valid = "{} is not a valid choice\n".format(choice)
    print(not_valid)

can you please explain why inputList was used as range in the for loop instead of the variable newlist itself?

can you please explain why inputList was used as range in the for loop instead of the variable newlist itself?

Because, inputList length will return the original length of user's input, whereas newList is empty initially and will lead to errors while appending,

Example: Iteration 1:
newList = []
for i in inputList:
z = int(i)
newList.append(z)

here, initially the size of newList is 0,

for i in newList => will be for i in 0 (in literal terms)