# File: userlist-example-1.py

import UserList

class AutoList(UserList.UserList):

    def __setitem__(self, i, item):
        if i == len(self.data):
            self.data.append(item)
        else:
            self.data[i] = item

list = AutoList()

for i in range(10):
    list[i] = i

print list