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Tue Jan 20 09:17:43 EST 2004 · https://mail.python.org/pipermail/python-dev/2004-January/042114.html

Here is anidea to kick around:

Evolve and eventually replace dict.setdefault with a more specialized 
method that is clearer, cleaner, easier to use, and faster.

       d.addlist(k, v)   would work like   d.setdefault(k, []).append(v)

Raymond Hettinger

>>> d = dict()
>>> for elem in 'apple orange ant otter banana asp onyx boa'.split():
...     k = elem[0]
...     d.addlist(k, elem)
...
>>> d
{'a': ['apple', 'ant', 'asp'], 'b': ['banana', 'boa'], 'o': ['orange',
'otter',
'onyx']}

bookindex = dict()
for pageno, page in enumerate(pages):
    for word in page:
        bookindex.addlist(word, pageno)

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[Python-Dev] dict.addlist()