Traceback (most recent call last):
File "/home/pi/Desktop/print.py", line 7, in <module>
ser = serial.Serial('/dev/ttyUSB0', 9600, timeout=10000)
File "/usr/lib/python3/dist-packages/serial/serialutil.py", line 240, in __init__
self.open()
File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 268, in open
raise SerialException(msg.errno, "could not open port {}: {}".format(self._port, msg))
serial.serialutil.SerialException: [Errno 2] could not open port /dev/ttyUSB0: [Errno 2] No such file or directory: '/dev/ttyUSB0'