Until now, we considered Python programs as self-contained functionalities. Python programs, however, run on a computer, and occasionally the program must deal with computer intricacies. This will start to play a major role from Chapter 17 onward, when I will discuss file handling. To deal with the computer, Python offers a series of standard functionalities in the os module, whereby os is a common abbreviation for “operating system.” This chapter explains the most important functions from the os module.