[Tutor] help with telnet error

[Kent Johnson]

Chris Hallman wrote:
> 
> I'm working on a program that telnets to multiple devices to test their 
> backup ISDN BRI connections. I'm trying to build in error recovery with 
> try/except logic, but I'm having trouble getting it to work. This first 
> example uses a host name that isn't in our DNS (yes, this does happen):
> 
>  >>> import telnetlib
>  >>> host = "s3793ap01"
>  >>> telnetlib.Telnet(host)
> 
> Traceback (most recent call last):
>   File "<pyshell#30>", line 1, in <module>
>     telnetlib.Telnet(host)
>   File "c:\python25\lib\telnetlib.py", line 208, in __init__
>     self.open(host, port)
>   File "c:\python25\lib\telnetlib.py", line 225, in open
>     for res in socket.getaddrinfo(host, port, 0, socket.SOCK_STREAM):
> gaierror: (11001, 'getaddrinfo failed')
>  >>>
>  >>>
>  >>>
>  >>>
>  >>> try:
>     telnetlib.Telnet(host)
> except gaierror, e:
>     print "error found", e
> 
> 
>    
> 
> Traceback (most recent call last):
>   File "<pyshell#16>", line 3, in <module>
>     except gaierror, e:
> NameError: name 'gaierror' is not defined

gaierror is defined in the socket module. Add
   import socket

then use
   except socket.gaierror, e:

Kent