Now that you've mastered the basic skills you need to write organized programs that are easy to use, it's time to think about making your programs even more relevant and usable. In this chapter, you'll learn to work with files so your programs can quickly analyze lots of data.
In addition to that you will also learn the powerful language for matching text patterns called regular expressions. In this lesson, we will give a basic introduction to regular expressions themselves sufficient for our Python exercises and shows how regular expressions work in Python. The Python re module provides regular expression support.