Hi, Thank you for your response. I fixed the parenthesis and it worked. I made little modification below. By default the output of the gethostbyaddr module includes three item (hostname, aliaslist, ipaddrlist). However, in my output I just what the hostname field. So I created a list but I am not able to pull out just the [0] item from this and instead I get the following error:TypeError: 'int' object is not subscriptable. I looked up the error but most examples that I found were not applicable to my code purpose. ---- import socket
in_file = open('top500ips.csv', 'r') out_file = open('top500ips_out.csv', 'w') ListOfIPAddresses = [] for line in in_file: try: name = socket.gethostbyaddr(line.strip()) ListOfIPAddresses.append(name) out_file.write(str(ListOfIPAddresses))[0] except socket.herror: out_file.write(line + '\t' + "No resolution available for ") in_file.close() out_file.close() ----- Also, could you please give some explanation of '\t'. Thanks. Thank you. On Sunday, August 16, 2015 5:58 PM, Alan Gauld <alan.ga...@btinternet.com> wrote: On 16/08/15 22:42, Nym City wrote: > import socket > import csv You don't need csv, you aren't using it. > in_file = open('top500ips.csv', 'r') > out_file = open('top500ips_out.csv', 'w') > > for line in in_file: > try: > name = socket.gethostbyaddr(line.strip()) > out_file.write(line + '\t' + (str(name)) count the parens in the line above... > except socket.herror: > out_file.write(line + '\t' + errrMsg) > > in_file.close() > out_file.close() > -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ http://www.amazon.com/author/alan_gauld Follow my photo-blog on Flickr at: http://www.flickr.com/photos/alangauldphotos _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor