That dir (=the whole python kingdom) is a softlink on the device, so it ends up being optified in the end.
The disk usage comes from webkit, based on the log snippet posten above, that sucker uses 17MB of rootfs space, though it might appear less due to the rootfs being compressed.
[sbox-FREMANTLE_X86: ~] > dpkg -L libqt4-webkit /. /opt /opt/lib /opt/lib/libQtWebKit.so.4.6.2 /usr /usr/lib /usr/share /usr/share/doc /usr/share/doc/libqt4-webkit /usr/share/doc/libqt4-webkit/changelog.Debian.gz /usr/lib/libQtWebKit.so.4 /usr/lib/libQtWebKit.so.4.6 /usr/lib/libQtWebKit.so.4.6.2
[sbox-FREMANTLE_X86: ~] > dpkg -L python2.5-qt4-webkit /. /usr /usr/lib /usr/lib/python2.5 /usr/lib/python2.5/site-packages /usr/lib/python2.5/site-packages/PyQt4 /usr/lib/python2.5/site-packages/PyQt4/QtWebKit.so