Building Command Line Utilities with Python

Building Command Line Utilities with Python: "When you write code, whether in Python or some other language, you probably have a goal that you or someone else will one day run it. A very common, useful, and powerful option for running your code is to call it from a command line. Writing your code so that it runs from the command line is easy. In fact, you don't have to do anything special to get it working on the command line."