The little Perl script can calculate how heavy a package depends on other packages and is depended by other packages, they are depicted by depends_score and rdepends_score.
Another purpose (also my original purpose) is to analyse the changes in unstable version, so I can know whether it's safe to update my desktop pc. I can also know which packages are changed actively. I found there are many circular dependence between packages, I regard direct circular dependent packages as one "package", but I don't know how to calculate properly depends_score and rdepends_score for indirect circular dependent packages, I set these scores all to - 100000000. Another question is there are some missing packages like perl-api, where are they? Each sub command of apt-update-stat.pl will take about 40 seconds on my PC (P4 2.80GHz/512M), and don't try "Data::Dumper" for *all* Packages files, it's very very very slow.
apt-update-stat.pl
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