go:
	# These work
	/usr/bin/python3 ./just-a-label.py
	/usr/bin/python3 ./just-a-button.py
	# These do not
	/usr/local/cpython-3.7/bin/python3 ./just-a-label.py
	/usr/local/cpython-3.7/bin/python3 ./just-a-button.py
	/usr/local/cpython-2.7/bin/python ./just-a-label.py
	/usr/local/cpython-2.7/bin/python ./just-a-button.py