Student grade db for Cryptic

from random import randrange

def database_sort(dictionary):
        return sorted([(a,b) for (b,a) in dictionary.items()], reverse=1)

def classaverage(total):
        return (total) / 9

def median(total):
        print (total) * 0.5

def print_to_text_file(database):
        with open('high.txt', 'w') as f:
                f.write('\n'.join('%s %s' % database[i] for i in xrange(3)))
        f.close()

        with open('medium.txt', 'w') as f:
                f.write('\n'.join('%s %s' % database[i] for i in xrange(3,6)))
        f.close()

        with open('low.txt', 'w') as f:
                f.write('\n'.join('%s %s' % database[i] for i in xrange(6, len(database))))
        f.close()

def create_number(database, new_name, total):
        grade = randrange(99) + 1
        database[new_name] = grade
        total = total + grade
        return database, total

def create_person(database, total):
        new_name = raw_input("What is the new name you want to add? ")
        return create_number(database, new_name, total)

def main():
        database = {}
        total = 0
        entry = 0
        while entry < 9:
                database, total = create_person(database, total)
                entry = entry + 1
        if entry == 9:
                print "You have successfully entered 9 names into the database"
                print "Your class average is", classaverage(total)
                sorted_db = database_sort(database)
                print database_sort(database)
                print_to_text_file(sorted_db)

if __name__ == "__main__":
        main()