title: Python code error message that I don't understand
body: <p>I am having problems decoding this error message for the python on my Raspberry Pi.  Please don't tell me to head to that SE, they sent me here as no one really knew what it means.  It is from [GitHub][1]</p>
  
  <p>Here is the error output:</p>
  
  <pre><code>Traceback (most recent call last):
      File "/home/pi/piarduino/MissionControl-master/mcDesk.py", line 8, in &lt;module&gt; serialFromArduino = serial.Serial("/dev/serial/by-id/usb-FTDI_FTDI_FT232R_USB_UART_A900aepy-if800-port0", 115200)
      File "/usr/lib/python2.7/dist-packages/serial/serialutil.py", line 260, in __init__
          self.open()
      File "/usr/lib/python2.7/dist-packages/serial/serialposix.py", line 276, in open
          raise SerialException("could not open por %s: %s" % (self._port, msg))
  SerialException: could not open port /dev/serial/by-id/usb-FTDI_FTDI_FT232R_USB_UART_A900aepy-if800-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-FTDI_FTDI_FT232R_USB_UART_A900aepy-if800-port0'
  </code></pre>