The UserList Module

The UserList module contains a list class that can be subclassed (simply a Python wrapper for the built-in list type).

In Example 2-16, AutoList instances work just like ordinary lists, except that they allow you to insert items at the end by assigning to them.

Example 2-16. Using the UserList Module

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 [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]