Error Handling In Python Try And Except

Error Handling In Python Try And Except 

In this script we will see how we can implement error handling in python scripting by using try and except method. Sometime is the there is an error in script or in the remote device where you are trying to connect then the script will break and stop working. Error handling using try and except method deals with these kind of situation.

Error Handling In Python Try And Except

Below is the script which we have used error handling. Watch the video for full explanation and subscribe to the channel for more such video.

import paramiko
p = paramiko.SSHClient()
cred = open("cred.csv","r")
for i in cred.readlines():
    try:
        line=i.strip()
        ls =line.split(",")
        p.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        p.connect("%s"%ls[0],port =22, username = "%s"%ls[1], password="%s"%ls[2])
        stdin, stdout, stderr = p.exec_command("uname -a")
        opt = stdout.readlines()
        opt ="".join(opt)
        temp=open("%s.txt"%ls[0],"w")
        temp.write(opt)
        temp.close()
    except Exception as error:
        print(error)
cred.close()


                  

Login To Multiple Server And Run Unix Command Python Script

Login To Multiple Server And Run Unix Command Python Script

In this script we will write python code which will login to multiple Unix server and execute an command. After that what ever output that command will give the script will save it in a text file.

Overview of Python Script. For live demo watch the video here.

1. Read Credential from CSV file
2. Login to multiple device one by one
3. Execute command
4. Save the output in txt file

Below is the script written python which will login to multiple device and execute command.
Below line will import a module called paramiko which is used for ssh connectivity to UNIX server.

import paramiko

Below line will initiate and object for ssh connectivity.

p = paramiko.SSHClient()

Below line will open a the credential file in read mode where we have credential for the devices.

cred = open("cred.csv","r")

Now below is the for loop which will iterate over each line of the file and get the credential, login to the device and execute a command. Then the ouput of the command for each device will be saved in a text file.

for i in cred.readlines():
    line=i.strip()
    ls =line.split(",")
    print(ls)
    p.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    p.connect("%s"%ls[0],port =22, username = "%s"%ls[1], password="%s"%ls[2])
    stdin, stdout, stderr = p.exec_command("uname -a")
    opt = stdout.readlines()
    opt ="".join(opt)
    print(opt)
    temp=open("%s.txt"%ls[0],"w")
    temp.write(opt)
    temp.close()
cred.close()
           
For More details watch the video and Subscribe and stay tuned for more such videos.