title: Assign variable to pyserial port
body: <p>I must assign to serial port a variable.</p>
  
  <pre><code>ser = serial.Serial(
  port=VARIABLE
  baudrate=115200,
  parity=serial.PARITY_NONE,
  stopbits=serial.STOPBITS_ONE,
  bytesize=serial.EIGHTBITS
  )
  </code></pre>
  
  <p>I try with <code>port=VARIABLE</code>, but that doesn't work. 
  It seems to accept only path but in my program I have many device.</p>