python-appimage/python_appimage/data/entrypoint.sh

for opt in "$@"
do
    [ "${opt:0:1}" != "-" ] && break
    if [[ "${opt}" =~ "I" ]] || [[ "${opt}" =~ "E" ]]; then
        # Environment variables are disabled ($PYTHONHOME). Let's run in a safe
        # mode from the raw Python binary inside the AppImage
        "$APPDIR/opt/{{ python }}/bin/{{ python }}" "$@"
        exit "$?"
    fi
done

# Get the executable name, i.e. the AppImage or the python binary if running from an
# extracted image
executable="${APPDIR}/opt/{{ python }}/{{ python }}"
if [[ "${ARGV0}" =~ "/" ]]; then
    executable="$(cd $(dirname ${ARGV0}) && pwd)/$(basename ${ARGV0})"
elif [[ "${ARGV0}" != "" ]]; then
    executable=$(which "${ARGV0}")
fi

# Wrap the call to Python in order to mimic a call from the source
# executable ($ARGV0), but potentially located outside of the Python
# install ($PYTHONHOME)
(PYTHONHOME="${APPDIR}/opt/{{ python }}" exec -a "${executable}" "$APPDIR/opt/{{ python }}/bin/{{ python }}" "$@")
exit "$?"