尝试生成到设备时观察TypeError

Question

我有一台Centos 7笔记本电脑连接到LAN端口上的设备。尝试登录我的设备并为我的自动化任务执行一些命令。我在Centos 7上安装了python 3.6.4。下面是笔记本电脑上的.py脚本..

#!/usr/local/lib python3.6
import pexpect
import sys
import re

def dologin(child):
    # Enter User Name
    child.expect ('login:')
    child.sendline ('admin')

    # Enter Password
    child.expect ('Password:')
    child.sendline ('123')
    return

def doprepcommands(child):
    # Enter config prompt
    child.expect ('NOS/27179080475072>')
    child.sendline ('config')

    # Issue command
    child.expect ('NOS/27179080475072/DEBUG/Config>')
    child.sendline ('show vlan')
    child.expect ('NOS/27179080475072/DEBUG/Config>')
    child.sendline ('exit')
    child.expect ('NOS/27179080475072/DEBUG>')
    child.sendline ('exit')
    child.expect ('NOS/27179080475072')
    child.sendline ('exit')
    return

# Spawn the telnet session
child = pexpect.spawn ('telnet 192.168.1.254')

 # Display progress on screen
child.logfile = sys.stdout
dologin(child)
doprepcommands(child)

当我运行脚本时，我在IDLE屏幕上观察到下面提到的错误。通过不同博客中的详细信息，我部分理解我的脚本中错误地使用了'sys.stdout'（需要以不同的方式使用python 2.7）和python 3.6）。我也试图找出我调用的函数'dologin（child）'，'doprepcommands（child）'是否使用了Python 3的正确语法。

我是Python的新手。有人可以帮我解决这个错误吗？

================= RESTART: /home/aricent/Siva/test_debug.py        =================
Traceback (most recent call last):
 File "/home/Siva/test_debug.py", line 37, in <module>
 dologin(child)
 File "/home/Siva/test_debug.py", line 8, in dologin
   child.expect ('login:')
 File "/usr/local/lib/python3.6/site-packages/pexpect/spawnbase.py",           line 341, in expect
 timeout, searchwindowsize, async_)
 File "/usr/local/lib/python3.6/site-packages/pexpect/spawnbase.py",     line 369, in expect_list
 return exp.expect_loop(timeout)
 File "/usr/local/lib/python3.6/site-packages/pexpect/expect.py",    line 111, in expect_loop
 incoming = spawn.read_nonblocking(spawn.maxread, timeout)
 File "/usr/local/lib/python3.6/site-packages/pexpect/pty_spawn.py", line 485, in read_nonblocking
 return super(spawn, self).read_nonblocking(size)
 File "/usr/local/lib/python3.6/site-packages/pexpect/spawnbase.py", line 179, in read_nonblocking
 self._log(s, 'read')
 File "/usr/local/lib/python3.6/site-packages/pexpect/spawnbase.py", line 126, in _log
 self.logfile.write(s)
 TypeError: must be str, not bytes 

Answer 1

我通过在不同的博客中进行一些可用的讨论来解决这个问题。我已将'spawn'替换为'spawnu'，现在我可以telnet到我的设备并根据需要执行操作。 child = pexpect.spawn（'telnet 192.168.1.254'）child.logfile = sys.stdout

child = pexpect.spawnu ('telnet 192.168.1.254', logfile=sys.stdout, timeout = None)