Telnet not working for os.system call

Question

Why cant I call the following in python using os?

import os
os.system('telnet 1.1.1.1')

yet when I open a terminal and use the exact command, I can telnet. I get the following when running the code:

'telnet' is not recognized as an internal or external command, operable program or batch file.

I have enabled TelnetClient and TelnetServer

Answer 1

@Jon S.: Programs like Telnet and SSH are interactive in nature. So when you open a telnet it will return something from the shell it is running to handle that particular connection. I haven't tried running the command like you mentioned above but I have used 'telnetlib' of python in Windows successfully in the past and still using it. Here is a snippet that can be of help.

import telnetlib
import os

host_ip = "1.1.1.1"
user = "user"
password = "password"

tnet_hndl = telnetlib.Telnet(host_ip)
print (tnet_hndl.read_until(b"login: "))
tnet_hndl.write(user.encode('ascii') + b"\n")
print (tnet_hndl.read_until(b"Password: "))
tnet_hndl.write(password.encode('ascii') + b"\n")
print (tnet_hndl.read_until(b"# "))
#tnet_hndl.set_debuglevel(1) #enable this if you want to debug more
tnet_hndl.write(b"<enter some windows cmd here>" + b"\n")
print (tnet_hndl.read_until(b"# "))
tnet_hndl.close()

Hope this helps.

Answer 2

Just try os.system('C:/Windows/System32/telnet.exe 1.1.1.1 <port number>') and see what happens?