place in .git/hooks/post-checkout to delete empty directories and pyc files

post-checkout

#! /bin/sh
echo "Purging pyc files and empty directories..."

# Start from the repository root.
cd ./$(git rev-parse --show-cdup)

# Delete .pyc files and empty directories.
find . -name "*.pyc" -delete 2>&1 > /dev/null &
find . -type d -empty -delete 2>&1 > /dev/null &