在python shell中运行telnet时出现错误消息 [英] Error message when running telnet in python shell

问题描述

下面是我的代码的一个最小示例，如果您运行它，应该会重现我的问题。我遇到的一件事是，如果我的树莓派（我正在使用出纳员连接的东西）关闭或拔掉了互联网电缆，则不会出现错误。

Below is a minimal example of my code, which If you run, should recreate the problem I have. One thing I have encounter that the error does not appear if my raspberry pi (the thing I am using teller to connect to) is turned off or the internet cable is unplugged.

#IMPORTS
import time
import telnetlib
import sys
import getpass


#TELNET
user = input("Please Enter Your Username: ")
time.sleep(0.4)
pass_ = input("Please Enter Your Password: ")

bot = telnetlib.Telnet("192.168.1.128")
bot.read_until("login: ".encode(),  timeout=None)
bot.write(user + "\n")
bot.read_until("Password: ".encode(),  timeout=None)
bot.write(pass_ + "\n")
bot.write("cd PiBits/ServoBlaster")

我收到以下错误消息：

Traceback (most recent call last):
  File "/Users/kiancross/Desktop/PROJECTS/RASPBERRY_PI/ROBOT/CONTROLLER_GUI/RPi_BOT_CONTROLLER.py", line 17, in <module>
    bot.write(user + "\n")
  File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/telnetlib.py", line 289, in write
    if IAC in buffer:
TypeError: 'in <string>' requires string as left operand, not bytes

我正在运行以下代码，您可以在

I was running the following code which you can see in this post but as you can see from the answer I changed it to the code above which resulted in the above error message.

我应该说代码没有完成的地方，直到telnet正常工作之前，很多事情都需要测试！

I should say that the code is no where near finished and a lot of things are just to test until I get telnet working!

我已经尝试了这篇帖子。

我使用了 print（type（user））查看变量是什么类型，它们是字符串。我已尝试如此修复程序中所示 bot.write（（user + \n）。encode（latin-1）），但错误消息仍然出现。我也尝试过用unicode编码。我知道该行的一部分编码错误，但是我不知道它是变量还是 \n 。我曾尝试做 bot.write（user + b \n），但这可以消除错误。

I have used print(type(user)) to see what kind the variables are and they are strings. I have tried bot.write((user + "\n").encode(latin-1)) as shown in this fix, but the error message still appears. I have also tried encoding in unicode. I understand that part of that line is encoded wrong but I don't know if it is the variables or the "\n". I have tried doing bot.write(user + b"\n") but this get rid of the error.

如果有人有其他方法可以阻止此错误，我将不胜感激。

If anybody has any other methods that could stop this error, I would greatly appreciate them.

谢谢

在python 3.4.0上运行的PS Im

P.S Im running on python 3.4.0

EDIT

我有尝试过这个：

bot = telnetlib.Telnet("192.168.1.128")
bot.write(user + "\n".encode('ascii'))
bot.read_until(b"Password: ")
bot.write((pass_ + "\n").encode('ascii'))

但我仍然遇到相同的错误。

But I still get the same error.

当我这样做时：

bot = telnetlib.Telnet("192.168.1.128")
bot.read_until(b"login: ")
bot.write(user + b"\n")
bot.read_until(b"Password: ")
bot.write(pass_ + b"\n")

我遇到了另一个错误：

Traceback (most recent call last):
  File "/Users/kiancross/Desktop/PROJECTS/RASPBERRY_PI/ROBOT/CONTROLLER_GUI/RPi_BOT_CONTROLLER.py", line 23, in <module>
    bot.write(user + b"\n")
TypeError: Can't convert 'bytes' object to str implicitly

所有错误似乎都说它必须是一个字符串，但我的变量已经是字符串。

All the error seem to say that It needs to be a string but my variables are already strings.

谢谢

推荐答案

telnet接口可能希望以非Unicode字节工作。我已经在Python3上测试了此代码，并且避免了该错误：

The telnet interface probably wants to work in bytes not Unicode. I have tested this code on Python3 and it avoids the error:

import telnetlib
bot = telnetlib.Telnet("127.0.0.1", 22)
user = "dobbs"
bot.write((user + "\n").encode('ascii'))
print(bot.read_all())

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