def menuChoice():
    print ("The Menu")
    print ()
    print ("1.  Display the Student List")
    print ("0.  Exit")

    choice = -1
    while choice < 0:
        choice = input("Enter your choice:  ")
        choice = int("01234".find(choice))
    return choice

def editStudentListMenu(studentList):
    options = {0 : quit,
               1 : displayStudentList,
               2 : addStudent,
               3 : editStudent,
               4 : deleteStudent}

    choice = menuChoice()
    while choice != 0:
        studentList = options[(choice)](studentList)
        choice = menuChoice()
    print ("Thank you for using the Marks Manager")

def displayStudentList(studentList):
    print (" your code to add a student here")

    return studentList

def addStudent(studentList):
    print (" your code to add a student here")
    return studentList

def changeStudent(studentList):
    print (" your code to change a student here")
    return studentList

def editStudent(studentList):
    print (" your code to edit a student here")
    return studentList

def deleteStudent(studentList):
    print (" your code to delete a student here")
    return studentList

def readFile():
    print ("your code to read the file")

    return studentList

def saveFile(studentData):
    print ("saving...")

def main():
    students = readFile()
    displayStudentList(students)
    editStudentListMenu(students)
    saveFile(students)

if __name__ == '__main__':
   main()