The problem I've noticed is that if I append the file with each of the 100k runs (one at a time), it can happen that two threads try to save to the file at the same time and some row(s) end up empty.

In this article, I'll be exploring the basics of Python, i.e. variables, input and output. You'll need Python ... However, say you wanted to write a program that asked a user his/her name.

You can also specify an option to output the results to a text file called "report.txt". Here are the options included in the script: usage: dns-revdns-lookup [-h] [-l] [-o] [-d DNS] [-r REV_DNS] [-V] ...