Python one-liner?

[Evan Driscoll]

On 4/13/2012 22:33, Evan Driscoll wrote:
>     d = {}
>     def appender(e):
>         d.get(f(e), []).append(e)
>     map(appender, l)

Just in case it isn't clear, the above has at least two problems and
won't even come close to working. :-)


Though I might as well ask another question... if I have a dict with
values which are lists, what's a good way to say "append x to the list
at key k, creating a list if it's not there"? dict.setdefault seems
potentially promising but the docs are crappy and don't say how it works.

Evan


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