Python mark book?

[Florrianer]

def markbook():
 
    names = []      
    marks = []      
 
    while True:     
        name = raw_input("Name: ")      
 
        if name == "exit":      
            break
        elif name == "print":     
            print "Name" + "      " + "Mark"
            for x in range(len(names)):
                print names[x] + "     " + marks[x]
        else:
            names.append(name)      
            mark = raw_input("Mark: ")      
            marks.append(mark)    

How would have written this program if you had to use dictionaries instead of lists?
Is it possible to write this markbook using tuples?

[andrean]

def markbook():
    names = dict()
 
    while True: 
        name = raw_input("Name: ") 
 
        if name == "exit": 
            break
        elif name == "print": 
            print "Name" + " " + "Mark"
            for name, mark in names.items():
                print "{0} {1}".format(name, mark)
        else:
            mark = raw_input("Mark: ") 
            names[name] = mark 
 
def markbook_tuple():
    names = list()
 
    while True: 
        name = raw_input("Name: ") 
 
        if name == "exit": 
            break
        elif name == "print": 
            print "Name" + " " + "Mark"
            for name, mark in names:
                print "{0} {1}".format(name, mark)
        else:
            mark = raw_input("Mark: ") 
            names.append((name, mark))

[bvdet]

Tuples would not work as coded because they are immutable. A dictionary would work. The names could be the dictionary keys and marks could be stored in a list for each unique key. Maybe like this:

def markbook():
 
    dd = {}
 
    while True:     
        name = raw_input("Name: ")      
 
        if name == "exit":      
            return dd
        elif name == "print":     
            print "Name" + "      " + "Mark"
            names = dd.keys()
            for name in names:
                for item in dd[name]:
                    print name + "     " + item
        else:
            dd.setdefault(name, [])    
            mark = raw_input("Mark: ")      
            dd[name].append(mark)
 
if __name__ == "__main__":
    print markbook()