当我尝试运行此Python程序时，出现回溯错误（最近一次调用最近）。 我想知道解决方案

Question

This is a Python program to receive the data from an XBee module using the python-xBee library. I have installed both the xbee and pyserial modules.

import serial
from xbee import XBee

serial_port = serial.Serial('/dev/ttyUSB0', 9600)
xbee = XBee(serial_port)

while True:
try:
    print xbee.wait_read_frame()
except KeyboardInterrupt:
   break

serial_port.close()

But when I run this and any kind of program with serial port, this is the error I am getting:

Traceback (most recent call last):
  File "C:/Users/Manurajeev/PycharmProjects/untitled/one.py", line 4, in
<module>
    serial_port = serial.Serial('/dev/ttyUSB0', 9600)
  File "C:\Python27\lib\site-packages\serial\serialwin32.py", line 31, in
__init__
    super(Serial, self).__init__(*args, **kwargs)
  File "C:\Python27\lib\site-packages\serial\serialutil.py", line 240, in
__init__
    self.open()
  File "C:\Python27\lib\site-packages\serial\serialwin32.py", line 62, in
open
    raise SerialException("could not open port {!r}:
{!r}".format(self.portstr, ctypes.WinError()))
serial.serialutil.SerialException: could not open port '/dev/ttyUSB0':
WindowsError(3, 'The system cannot find the path specified.')

Process finished with exit code 1

I don't understand what the problem is. I tried everything, but the same error keeps popping up every time.

Answer 1

In Linux, check the permissions on the tty device ( ls -l /dev/ttyUSB0 ) to ensure that you have read/write access to it. Note that it might have a different name.

For Windows, have you been able to open COM5 with a terminal emulator and send/receive data on the XBee? Do you still have it open in another program when you're trying to open it in Python? Only one program can access a COM port at a time.