Error message when running telnet in python shell
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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Updated on June 04, 2022Comments
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Admin about 2 years
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")
I get the following error message:
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
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.
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!
I have tried the fix for the older version of python mentioned in this post.
I have used
print(type(user))
to see what kind the variables are and they are strings. I have triedbot.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 doingbot.write(user + b"\n")
but this get rid of the error.If anybody has any other methods that could stop this error, I would greatly appreciate them.
Thanks
P.S Im running on python 3.4.0
EDIT
I have tried this:
bot = telnetlib.Telnet("192.168.1.128") bot.write(user + "\n".encode('ascii')) bot.read_until(b"Password: ") bot.write((pass_ + "\n").encode('ascii'))
But I still get the same error.
When I do:
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")
I get a different error:
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
All the error seem to say that It needs to be a string but my variables are already strings.
Thanks