bobCharlesmortgage

import pickle
username = 0
password = 0
answer = 0
pickle_in = open("users.pickle", "rb")
userList = pickle.load(pickle_in)
user = []
initPay = 0
interest = 0
lenYears = 0
lenMonths = 0
monInterest = 0
monPayment = 0
currentMI = 0
principalMon = 0
newPay = 0
currentMI = 0
monPrincipal = 0
newPay = 0

def run():
    global answer
    print("\n\nWELCOME TO YOUR MORTGAGE CALC! \n\n IF YOU ARE A REGISTERED USER, ENTER 1,\n IF YOU ARE A GUEST, PLEASE REGISTER BY ENTERING 2, \n")
    try:
        answer = int(input(">> "))
        if answer == 1:
            existingUser()
        elif answer == 2:
            register()
        elif answer == 3:
            admin()
        else:
            "Incorrect entry, enter one of the available options"
            run()
    except ValueError:
        print("Invalid Entry, please re-try \n\n")
        run()

def existingUser():
    global username
    global password
    global user
    global userList
    pickle_in = open("users.pickle", "rb")
    userList = pickle.load(pickle_in)
    try:
        usernameCheck = input("USERNAME: >> ")
        search = usernameCheck
        print(userList)
        for sublist in userList:
            if search in sublist:
                print("Found it!", sublist)
                break
                username = usernameCheck
                print("WELCOME BACK, ", username)
            else:
                print("No such username")
                run()

    except ValueError:
        print("Invalid Entry, please re-try \n\n")
        run()

def register():
    global user
    global userList
    global username
    global password
    user = []
    print("\n\n PLEASE ENTER A -  \n\n ")
    try:
        username = (input("USERNAME: >> "))
        user.append(username)
        password = (input("PASSWORD: >> "))
        user.append(password)
        userList.append(user)
        print(username, password, user, userList)
        calc()
    except:
        print("Invalid Entry, please re-try \n\n")
        register()
def admin():
    print("admin")

def calc():
    global user
    global initPay
    global lenYears
    global userList
    global lenMonths
    global monInterest
    global currentMI
    global monPrincipal
    global newPay
    print("\n\n WELCOME ", username, "!\n\n")
    try:
        initPay = int(input("ENTER YOUR LOAN: >> "))
        interest = float(input("ENTER YOUR INTEREST RATE: >> "))
        lenYears = int(input("ENTER THE AMOUNT OF YEARS OF LOAN: >> "))
        user.append(initPay)
        user.append(interest)
        user.append(lenYears)
        lenMonths = lenYears * 12
        monInterest = interest/(12*100)
        user.append(lenMonths)
        user.append(monInterest)
        monPayment = initPay * (monInterest/(1-((1+monInterest)**(-1*lenMonths))))
        user.append(monPayment)
        newPay = initPay
        month = 1
        print("\n\n# | PAYMENT PER MONTH | REMANING PAY")
        while newPay >= 0:
            currentMI = initPay * monInterest
            monPrincipal = monPayment - currentMI
            newPay = initPay - monPrincipal
            initPay = newPay
            print(month, " |$", int(monPrincipal), " | $", int(newPay), "\n")
            month +=1
        print("\n\n", user, " ", "\n\n")
        pickle_out = open("users.pickle", "wb")
        pickle.dump(userList, pickle_out)
        pickle_out.close()

    except:
        print("Invalid Entry, please re-try \n\n")
        calc()
run()
while True:
    answer = str(input("type:>> back to return to run function"))
    if answer == back:
        run()