updated buttonscript

main.py

@@ -44,10 +44,9 @@ else:
 	try:
 		# If the rpi_ws281x Python module is available, then use that...
 		from raspberrypihal import RaspberryPiHAL as HAL
-	except :
+	except Exception as e:
 		# ...else assume that there's an MCU (driving the display) connected
 		# to a serial port
-		e = sys.exc_info()[0]
 		print('HAL: failed: {}'.format(e.args[0]))
 		from arduinoserialhal import ArduinoSerialHAL as HAL