This is the best thing since sliced bread, but it doesn't work for me on a recent Ubuntu. Tried with both Python 2 and 3.

Compare:

  $ sudo du -sb /etc/* | sort | uniq | sort -rn | head -10
  2897355 /etc/brltty
  436966  /etc/java-11-openjdk
  402728  /etc/ssl
  251196  /etc/apparmor.d
  244732  /etc/ImageMagick-6
  219185  /etc/X11
  170093  /etc/fonts
  144084  /etc/java-8-openjdk
  131407  /etc/init.d
  117524  /etc/systemd

With:

  $ sudo du -sb /etc/* | distribution
                           Key|Ct (Pct)   Histogram
                 9795     /etc/ssh|1 (0.40%) -----------------------------------------
  97442   /etc/speech-dispatcher|1 (0.40%) -----------------------------------------
            9592  /etc/sysctl.d|1 (0.40%) -----------------------------------------
      9461        /etc/update-manager|1 (0.40%) -----------------------------------------
          9438    /etc/locale.gen|1 (0.40%) -----------------------------------------
         9376     /etc/libreoffice|1 (0.40%) -----------------------------------------
             92   /etc/host.conf|1 (0.40%) -----------------------------------------
              91  /etc/networks|1 (0.40%) -----------------------------------------
         9077     /etc/libblockdev|1 (0.40%) -----------------------------------------
                  9074    /etc/pm|1 (0.40%) -----------------------------------------
           9013   /etc/bluetooth|1 (0.40%) -----------------------------------------
             890  /etc/gshadow-|1 (0.40%) -----------------------------------------
              890 /etc/gshadow|1 (0.40%) -----------------------------------------
                8894      /etc/skel|1 (0.40%) -----------------------------------------
                  887     /etc/rpc|1 (0.40%) -----------------------------------------

The indentation is all janky. And it's not sorted how I'd like.

Wow, I didn't know I needed this but after looking at it I realized I do.