myersg@SOI-MYERSG:~$ cd hellolt
myersg@SOI-MYERSG:~/hellolt$ python hello.reflect.45.py
command line: hello.light.45.py serial_port
myersg@SOI-MYERSG:~/hellolt$ sudo python hello.reflect.45.py
[sudo] password for myersg:
command line: hello.light.45.py serial_port
myersg@SOI-MYERSG:~/hellolt$ sudo python hello.reflect.45.py
command line: hello.light.45.py serial_port
myersg@SOI-MYERSG:~/hellolt$ myersg
myersg: command not found
myersg@SOI-MYERSG:~/hellolt$  python hello.reflect.45.py
command line: hello.light.45.py serial_port
myersg@SOI-MYERSG:~/hellolt$ myersg
myersg: command not found
myersg@SOI-MYERSG:~/hellolt$ python hello.reflect.45.py /dev/ttyUSB0
Traceback (most recent call last):
  File "hello.reflect.45.py", line 75, in <module>
    ser = serial.Serial(port,9600)
  File "/usr/lib/python2.7/dist-packages/serial/serialutil.py", line 261, in __init__
    self.open()
  File "/usr/lib/python2.7/dist-packages/serial/serialposix.py", line 278, in open
    raise SerialException("could not open port %s: %s" % (self._port, msg))
serial.serialutil.SerialException: could not open port /dev/ttyUSB0: [Errno 13] Permission denied: '/dev/ttyUSB0'
myersg@SOI-MYERSG:~/hellolt$ sudo python hello.reflect.45.py /dev/ttyUSB0
Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1489, in __call__
    return self.func(*args)
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 536, in callit
    func(*args)
  File "hello.reflect.45.py", line 40, in idle
    byte4 = ord(ser.read())
  File "/usr/lib/python2.7/dist-packages/serial/serialposix.py", line 460, in read
    raise SerialException('device reports readiness to read but returned no data (device disconnected?)')
SerialException: device reports readiness to read but returned no data (device disconnected?)
^CTraceback (most recent call last):
  File "hello.reflect.45.py", line 101, in <module>
    root.mainloop()
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1073, in mainloop
    self.tk.mainloop(n)
KeyboardInterrupt
myersg@SOI-MYERSG:~/hellolt$ ^C
myersg@SOI-MYERSG:~/hellolt$ ^C
myersg@SOI-MYERSG:~/hellolt$ ^C
myersg@SOI-MYERSG:~/hellolt$