Student progress counter

#!/usr/bin/env python2
# -*- coding: utf-8 -*-

import sys
import cPickle as pickle

class StudentsBase:
    def __init__(self):
        self.students = []

    def add_student(self):
        name = str(raw_input("Enter new student name: "))
        scores_mini = []
        scores_homework = []
        scores_test = []
        scores_atboard = []
        key_index = len(self.students) + 1
        newStudent = Student(key_index,name,scores_mini,scores_homework,scores_test,scores_atboard)
        self.students.append(newStudent)
    def __repr__(self):
        string = "\n"
        for student in self.students:
            string += str(student.key_index) + ": "
            string += student.name + "\n"
        return string
    def delete_last_student(self):
        self.students.pop()
    def edit_student(self,key):
        state = -1
        for s in self.students:
            if s.key_index == key:
                state,s = s.edit()
            if state == 1:
                break
        if state == -1:
            print "No such student!"
    def save(self,filename):
        with open(filename,'wb') as dest:
            pickle.dump(self,dest,-1)
    def load(self,filename):
        with open(filename,'rb') as src:
            self = pickle.load(src)
            print "Database loaded from file:" + filename
            return self

class Student:
    def __init__(self,key_index,name,scores_mini,scores_homework,scores_test,scores_atboard):
        self.key_index = key_index
        self.name = name
        self.scores_mini = scores_mini
        self.scores_homework = scores_homework
        self.scores_test = scores_test
        self.scores_atboard = scores_atboard
    def edit(self):
        no_changes = self
        print "Editing student: " + self.name
        MESSAGE = """What would you like to edit?
1 - name
2 - scores of mini tests
3 - scores of homework
4 - scores of tests
5 - scores of boards
s - accept and save changes
q - exit without saving changes\n"""
        while True:
            c = raw_input(MESSAGE)
            if c == '1':
                self.name = raw_input("Enter new student name: ")
                continue
            elif c == '2':
                print "Current scores of mini-tests: ",self.scores_mini
                editlist(self.scores_mini)
                continue
            elif c == '3':
                print "Current scores of homework: ",self.scores_homework
                editlist(self.scores_homework)
                continue
            elif c == '4':
                print "Current scores of tests: ",self.scores_test
                editlist(self.scores_test)
                continue
            elif c == '5':
                print "Current scores for boards: ",self.scores_atboard
                editlist(self.scores_atboard)
                continue
            elif c == 'q':
                return 1,no_changes
            elif c == 's':
                break
            else:
                print "Invalid option. Try again."
                continue
        return 1,self

def editlist(list_):
    MESSAGE = """Select an option:
a - add score to list
d - delete last score from list
p - print list
q - return to editing\n"""
    while True:
        c = raw_input(MESSAGE)
        if c == 'a':
            list_.append(int(raw_input("Enter score to add: ")))
            continue
        if c == 'd':
            try:
                print "Deleted",list_.pop(),"from scores."
            except IndexError:
                print "Nothing to delete there!"
            continue
        if c == 'p':
            print list_
            continue
        if c == 'q':
            return list_

def main():
    Base = StudentsBase()
    if len(sys.argv) >=3:
        print "You listed too much input files. Working only with first (" + sys.argv[1] + ")"
        Base = Base.load(sys.argv[1])
    elif len(sys.argv) == 1:
        print "No database loaded!"
    else:
        Base = Base.load(sys.argv[1])
    MESSAGE = """What would you like to do?
a - add student to database
e - edit student
d - delete last student
l - load database
p - print database
s - save database
q - quit\n"""
    while True:
        c = raw_input(MESSAGE)
        if c == 'a':
            Base.add_student()
            continue
        if c == 'e':
            key = int(raw_input("Enter number of student to edit:"))
            Base.edit_student(key)
            continue
        if c == 'd':
            try:
                Base.delete_last_student()
            except IndexError:
                print "No students to delete from!"
            continue
        if c == 'l':
            filename = raw_input("Enter file to read:")
            Base = Base.load(filename)
            continue
        if c == 'p':
            print Base
            continue
        if c == 's':
            filename = raw_input("Enter file to write:")
            Base.save(filename)
            continue
        if c == 'q':
            sys.exit()
        else:
            print("Invalid option. Try arain.")
            continue
if __name__ == "__main__":
    main()