self-installing git-hook to remove stale *.pyc files and empty directories when switching branches.

post-checkout.sh

#!/bin/bash

mybasename=`basename $0`
if [ ! -e .git/hooks/${mybasename} ] ; then
    ln -s ../../git-hooks/${mybasename} .git/hooks/${mybasename}
fi

if [ $3 ] && [ $3 -eq '1' ] ; then
    # Start from the repository root.
    pushd ./$(git rev-parse --show-cdup) > /dev/null

    # Delete .pyc files
    find . -name "*.pyc" -delete 2>&1 > /dev/null &

    # Delete empty directories
    find . -type d -empty -delete

    # Go back to wherever you were
    popd > /dev/null
fi