python 3.x - adding functions to self made calculator -

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ok i'm trying make working napier numeral calculator. have gone through of steps need make work. need 2 more steps function , converting napier numbers. i'm stuck on getting functions work. seems skip step. can tell should work , not skipped. tell me if missed step in process of making function. 

    def main():     response = 'y'     while response == 'y' or response == 'y':         nap1 = getnapier()         num1 = naptoint(nap1)                 print(num1)         nap2 = getnapier()         num2 = naptoint(nap2)         print(num1, num2)         operator = getoperator         result = domath(num1, num2, operator)            response = input("try another[y/n]") def domath(num1, num2, operator):     if operator == "+":         answer = num1 + num2     elif operator == "-":         answer = num1 - num2     elif operator == "*":         answer = num1 * num2     else:         if operator == "/":             answer = num1 / num2     return domath def getoperator():     op = input("enter operator: ")     while op not in "+-*/":         op = input("error!!!! enter operator: ")     return op def naptoint(n):     result = 0     ch in n:         result += 2 ** (ord(ch) - ord('a'))     return result def getnapier():     nap = input("enter napier number: ")     while not nap.isalpha():         nap = input("error!!! enter napier number: ")     return nap main()

this result can see gets napier numbers , stops

 enter napier number: asdf 262185 enter napier number: adsf 262185 262185 try another[y/n]

your line operator = getoperator should operator = getoperator()


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