How to fix while loop within function?

My code works, and asks to name the file, and how many numbers. But it just keeps asking for numbers, and if I put zero then it does what it is suppose too. any help at all is appreciated very much. I just don't know how to fix the code, and it is really bugging me.

import random
    def generateRandomNumber(myfile):
        try:
            fileToBeWrittenTo = open(myfile,"w")
            numberOfRandomNumbers = int(input("How many numbers" + \
                                          " should the random file hold?:" ))
        except Exception as potentialError:
            print("An error has occured:", potentialError )
        else:
            for randomNumberCount in range(1, numberOfRandomNumbers + 1 ):
                randomNumber = generateRandomNumber(myfile)
                fileToBeWrittenTo.write(str( randomNumber ) + '\n' )
            print( numberOfRandomNumbers, "numbers have been written" + \
                   " to the file ")
        finally:
            fileToBeWrittenTo.close()
            print("\nEnd of program")
        displayNumber(myfile)
        randomNumber = random.randint(1,500)
        return randomNumber
    def main():
        myfile = str(input("Enter file name here "))
        with open(myfile, 'w+') as f:
            generateRandomNumber(myfile)

        return f
        myfile.close





    def displayNumber(myfile):
        try:
            myfile = open(myfile,'r')
            total = 0
            NORN = 0
            Avg = 0
            line = myfile.readline()
            while line != "":
                randomNumber = int(line)
                total += randomNumber
                NORN += 1
                Avg = total / NORN
                print( randomNumber )
            line = myfile.readline()
        except IOError:
            print("Problem with file being opened")
        else:
            print("The average of the numbers is " + str(Avg))
            print("The total of all the numbers is " + str(total)+\
              "\nThere are " + str(NORN)+\
              " in the file")
            myfile.close()
        finally:
            print("End of program")

    main()