Improved calculator (Open-Source, Python3)

calculator.py

credits = """
Made by Simon Heppner
on 9th of May, 2018
"""

print(credits)
def addition(int1, int2):
    return (int1 + int2)

def subtraction(int1, int2):
    return (int1 - int2)

def division(int1, int2):
    if int2 == 0:
        print("Division by 0 isn't an option!")
        break
    return (int1 / int2)
  
while True:
    i = input("[A]ddition, [S]ubtraction, [D]ivision or [Q]uit? > ")
    if i != "":
        if i == "A":
            while True:
                i1 = input("Please enter the first number! > ")
                if i1 != "":
                    while True:
                        i2 = input("Please enter the second number! > ")
                        if i2 != "":
                            value = addition(i1, i2)
                            print(value)
                        elif i2 == "":
                            print("Please enter a valid number!")
                            continue
                elif i == "":
                    print("Please enter a valid number!")
                    continue
        if i == "S":
            while True:
                i1 = input("Please enter the first number! > ")
                if i1 != "":
                    while True:
                        i2 = input("Please enter the second number! > ")
                        if i2 != "":
                            value = subtraction(i1, i2)
                            print(value)
                        elif i2 == "":
                            print("Please enter a valid number!")
                            continue
        if i == "D":
            while True:
                i1 = input("Please enter the first number! > ")
                if i1 != "":
                    while True:
                        i2 = input("Please enter the second number! > ")
                        if i2 != "":
                            value = division(i1, i2)
                            print(value)
                        elif i2 == "":
                            print("Please enter a valid number!")
                            continue
        if i == "Q":
          break
    elif i == "":
        print("Nothing is not an option!")
        continue

Not sure it works correctly!