Thank you for your response. I gave it another try: As suggested, first I ran the concept just in the terminal, and it worked fine: >>> names =['173.252.120.6', '98.139.183.24'] >>> import socket >>> for name in names: socket.gethostbyaddr(name) print(name) output: ('edge-star-shv-12-frc3.facebook.com', [], ['173.252.120.6']) ('ir2.fp.vip.bf1.yahoo.com', [], ['98.139.183.24']) However, when I run it in a program, from a CSV file, it just outputs the content of the CSV file without running it thought socket.gethostbyaddr(): import csv import socket
domains = [] with open('top500ips.csv', 'r') as f: for line in f: line = line.strip() domains.append(line) for name in domains: socket.gethostbyaddr(name) print(name) output: 173.252.120.6 98.139.183.24 What am I missing? Thank in advance. Thank you. On Saturday, July 18, 2015 7:09 PM, Danny Yoo <danny....@gmail.com> wrote: On Jul 18, 2015 3:50 PM, "Nym City via Tutor" <tutor@python.org> wrote: > > Thank you all for your responses. I have a follow up question: > > So if gethostbyname_ex() takes only a single hostname string, how can I use > it to go through a list of hostnames and get their IP resolution as an output? > Look into loops. If you have a function that works on a single thing, you can use a loop to apply that function for each element in a list. Any good tutorial should show how to do this.Let us know if you run into difficulties. _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor