After String.format() with a value read from a file the resulting string does not contain the part after the inserted value

Question

I have a script that uses SSH via Paramiko to login to switches and initiate a TFTP copy of the startup-config. This almost works like I want except the file name does not include the .txt file type.

The specific line I'm working with is:

command.send("copy startup-config tftp://192.168.0.1/Backup-{}.txt \n".format(i))

Tried looking at examples on Google.

#!/usr/bin/env python3
###############################################
# THIS SCRIPT SAVES THE RUNNING-CONFIG TO     #
# STARTUP-CONFIG AND THEN COPIES THE          #
# STARTUP-CONFIG TO THE SPECIFIED IP VIA TFTP # 
###############################################
#
import paramiko
import sys, time
#
username = 'user'
password = 'pass'
#
with open('Advantech_Test_IPs', 'r') as host_list:
    for i in host_list:
        str(i)
        try:
            ssh_client = paramiko.SSHClient()
            ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
            ssh_client.connect(i, username=username, password=password)
            command = ssh_client.invoke_shell()
            command.send("copy running-config startup-config \n")
            time.sleep(1)
            command.send("copy startup-config tftp://.../Backup-{}.txt \n".format(i))
            time.sleep(1)
            ssh_client.close
            print(i, "BACKUP COMPLETE")
        except paramiko.ssh_exception.NoValidConnectionsError as e:
            pass
            print(i, "No Valid Connections")
        except paramiko.ssh_exception.AuthenticationException as ea:
            print(i, "Authentication Failed")
        except paramiko.ssh_exception.BadHostKeyException as eb:
            print(i, "Bad Host Key")
        except Exception as ex:
            print(i, "SOMETHING WENT WRONG!")
print("All done.")

The file gets copied over, but the .txt file extension is not appended so I end up with file types that match the last part of the IP address.

Answer 1

The i contains a new line at the end. So effectively you are sending a two lines to the server:

copy startup-config tftp://192.168.0.1/Backup-IP
.txt

You can use str.strip (or str.rstrip) to remove the newline:

command.send("copy startup-config tftp://192.168.0.1/Backup-{}.txt \n".format(i.strip()))