How to efficently build a nested dictionary

[Aahz Maruch]

In article <3AAA2042.E69A53FC at gmx.de>,
Carsten Gaebler  <cgaebler at gmx.de> wrote:
>
>I wrote a script for FTP traffic accounting, i.e. for each "top level"
>FTP directory it counts the bytes transferred per day. The traffic is
>stored in a dictionary that has the following structure:
>
>traffic = {dir: {year: {month: {day: 42}}}}

I think Emile's suggestion to use a single compound key is a good one.
If that's not sufficient *and* you can use Python 2.0, take a look at
the dict.setdefault() method.
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