/usr/share/debhelper/autoscripts/prerm-pypyclean is in dh-python 1.20140128-1ubuntu8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | if which pypyclean >/dev/null 2>&1; then
pypyclean -p #PACKAGE# #ARGS#
else
dpkg -L #PACKAGE# | perl -ne 's,/([^/]*)\.py$,/__pycache__/\1.*, or next; unlink $_ or die $! foreach glob($_)'
find /usr/lib/pypy/dist-packages/ -type d -name __pycache__ -empty -print0 | xargs --null --no-run-if-empty rmdir
fi
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