December 2011
Beginner
508 pages
13h 42m
English
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CHAPTER 4
Text Data, Files, and Exceptions
4.5 Case Study: Logging File Access
Solutions to Practice Problems
IN THIS CHAPTER, we focus on the Python tools and problem-solving patterns for processing text and files.
We take a running start by continuing the discussion of the string class we began in Chapter 2. We discuss, in particular, the extensive set of string methods that give Python powerful text-processing capabilities. We then go over the text-processing tools Python provides to control the format of output text.
After having mastered text processing, we cover files and file input/output (I/O) (i.e., how to read from and write to files from within a Python program).
Much of today's computing involves the processing of text content stored in files. We define several patterns for reading files that prepare the file content for processing.
Working with data coming interactively from the user or from a file introduces a source of errors for our program that we cannot really control. We go over the common errors that can occur. Finally, in this chapter's case study, we showcase the text-processing and I/O concepts introduced in the chapter in the context of an application that logs accesses to files.
4.1 Strings, Revisited
In Chapter 2 we introduced the string class str. Our goal then was to show that Python supported values other than numbers. We showed how string ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.