[Tutor] ​How to use the returned telnet object after creating the telnet session.

[Manju M]

Hello all,

First I would like thank you for creating such good platform for discussing
python..!!!

Assume that I will pass IP and port information from a function to open the
telnet session. have opened the telnet session and after opening the telnet
session I returned telnet object to calling function.

Now in the calling function If I use that object to read or write to
terminal I'm getting ERROR “AttributeError: 'NoneType' object has no
attribute 'read_very_eager'”.


#Open telnet connection to devices

def open_telnet_conn(dname,ip,port):

try:
TELNET_PORT = port
TELNET_TIMEOUT = 5
READ_TIMEOUT = 5
cmd = "show config"
#Logging into device

connection=telnetlib.Telnet(ip, TELNET_PORT, TELNET_TIMEOUT)

time.sleep(1)
connection.write(cmd + "\n")

#Here I'm able to write to connection object..
connection.write("\n")
time.sleep(2)

router_output = connection.read_very_eager()
print router_output

return(connection)

except IOError:

print "Input parameter error! Please check username, password and file
name."


#Function to read device IP and port . and this info for opening the telnet
session.
def IP_port(file):
T = []
F = open(file,'r')
F.seek(0)

line=F.read()
tuples = re.findall(r'(.+?)\s+(.+?)\s+(\d+)',line)

#(dname,IP,port)= tuples

for (dname,ip,port) in tuples:
T1=open_telnet_conn(dname,ip,port)
#HERE I will get the telnet object point to the same location as the
connection object. But I'm unable to write or read anything here. I think
need to convert the object T1 to TELNET CLASS object type..

print T1
T1.write("show config") <<<<<<<<<ERROR PART

router_output = T1.read_very_eager()
print router_output
T.append(T1)
return(T)


# import the LC/RSP name ,port and IP address
file='/users/manmahal/MANJU/IP_port.txt'
list_of_telnet=IP_port(file)



*NOTE*: the content of the file is as below:

RSP1 172.27.40.60 2002

RSP0 172.27.40.60 2001

LC0 172.27.40.60 2010


Idea is to create the telnet sessions store them in list or dictionary use
them as and when needed.
Any thought or solution is welcome...!!!



Regards

Manju