My first ever python script that i created long time ago, comments and all are left untouched

moneyConverter.py

#.....................................................................................................
#......................If using python 3 than change raw_input() to just input()......................
#.....................................................................................................

import time
#import time is used to get time
#Exchange rate is set to float because float contain decimals point while int dont have decimal point
exchangeRate = float(63.819)


def usd_to_rupee():
    print("Enter your amount: ")
    while True:
        try:
            amountEntered = float(input())
            break #except is used to handle error
        except ValueError:
            print("You Got to try inserting numerical Value")
        except KeyboardInterrupt:
            SystemExit(0)
    amount1 = amountEntered * exchangeRate
    print(amountEntered, "USD is equal to ", amount1, "INR")
    print("")
    time.sleep(0.5)# 0.5 means 0.5 second changing to to 1 will make it wait 1 sec before running function, sleep means wait
    converter()


def rupee_to_usd():
    print("Enter your amount: ")
    while True:
        try:
            amountEntered = int(input())
            break
        except ValueError:
            print("You Got to try inserting numerical value")# again this is used to handle error
        except KeyboardInterrupt:
            SystemExit(0)
    amount2 = amountEntered/exchangeRate
    print(amountEntered, "INR is equal to ", amount2, "USD")
    time.sleep(0.5)
    converter()


def converter():
    print("Press 1 to convert USD to INR\n Press 2 to convert INR to USD\nIf you want to quit press '3'")
    while True:
        try:
            convert = int(input())
            break
        except ValueError:
            print("You Got to try inserting 1 , 2 or 3")
        except KeyboardInterrupt:
            SystemExit(0)

    if convert is 1:
        usd_to_rupee()
    elif convert is 2:
        rupee_to_usd()
    elif convert is 3:
        quit()
    else:
        retry()


def finish():
    quit(converter())

#This will retry if value is other than 1,2,3. Such as 'e','6'.
def retry():
    print("Only use '1', '2', '3' ")
    converter()


converter()