ignore socket.error in python

Question

using a simple code to get hostname from ip address.

#!/usr/bin/python
import socket
import os
import sys

try:
        fdes = open ("ip.txt","r")
        for line in fdes.readlines():
                print socket.gethostbyaddr(line)
except Exception:
        pass

e.g ip.txt have ip address:

10.10.1.10, 10.10.1.20, 10.10.1.30, 10.10.1.40, 10.10.1.50, 10.10.1.60, 10.10.1.70,

there is no hostname for 10.10.1.40, so the code breaks here, do not continue further, Error is "socket.herror:[errno 1] Unknown Host"

how i can forcefully ignore the error if a hostname is not available for as ip address ?

usually try/except surrounds one critical statement, if it fails all of its block are skipped. — admirableadmin
– admirableadmin, Commented Jan 15, 2014 at 15:05

score 2 · Accepted Answer · 2014-01-15 15:08:08Z

2

This moves the hostname related code into the try/except block, while keeping the file reading stuff out of it; so if an exception is thrown your file reading code will still continue.

fdes = open("ip.txt","r")

for line in fdes.readlines():
    try:
        print socket.gethostbyaddr(line)
    except socket.error:
        pass

Note: this code only ignores socket.error exceptions while leaving all other exceptions unhandled (so a Ctrl+C which throws a KeyboardInterrupt will still stop the program).

edited Jan 15, 2014 at 15:08

answered Jan 15, 2014 at 14:55

user2629998

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1 Comment

user2629998 Over a year ago

@Nabla true, but I try to keep my code as similar as possible to the OP's code.

Joel Cornett · Accepted Answer · 2014-01-15 22:45:31Z

1

Replace Exception in your code with socket.error:

try:
    # Do something with sockets that might throw an error
except socket.error:
    pass # Basically, ignore the error

This will ensure that you don't unintentionally ignore other errors in your code.

If you want to do something with the error, perhaps log it, use this code:

try:
    # Operation that might throw a socket error
except socket.error as e:
    print e
    # Do something with the error object

edited Jan 15, 2014 at 22:45

answered Jan 15, 2014 at 15:00

Joel Cornett

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1 Comment

user2230193 Over a year ago

thanks, pardon my layman ship with scripting, what should i put here to replace # ONLY catch socket errors

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