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defaultlist.DefaultList

Source

A sub-class of list that automatically grows when setting an index beyond the list size.

• When creating a list, use DefaultList(default, ...) to specify a function that returns default value when visiting an unassigned index.

Tip

This library is designed to be highly similar to collections.defaultdict in standard library.

l = DefaultList(lambda: None, range(10))

l[11] = 11

l
# [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, None, 11]