Book Image

Learn Programming in Python with Cody Jackson

By : Cody Jackson
Book Image

Learn Programming in Python with Cody Jackson

By: Cody Jackson

Overview of this book

Python is a cross-platform language used by organizations such as Google and NASA. It lets you work quickly and efficiently, allowing you to concentrate on your work rather than the language. Based on his personal experiences when learning to program, Learn Programming in Python with Cody Jackson provides a hands-on introduction to computer programming utilizing one of the most readable programming languages–Python. It aims to educate readers regarding software development as well as help experienced developers become familiar with the Python language, utilizing real-world lessons to help readers understand programming concepts quickly and easily. The book starts with the basics of programming, and describes Python syntax while developing the skills to make complete programs. In the first part of the book, readers will be going through all the concepts with short and easy-to-understand code samples that will prepare them for the comprehensive application built in parts 2 and 3. The second part of the book will explore topics such as application requirements, building the application, testing, and documentation. It is here that you will get a solid understanding of building an end-to-end application in Python. The next part will show you how to complete your applications by converting text-based simulation into an interactive, graphical user interface, using a desktop GUI framework. After reading the book, you will be confident in developing a complete application in Python, from program design to documentation to deployment.
Table of Contents (14 chapters)

File I/O

File creation is extremely easy with Python: you simply create the variable that will represent the file, open the file, give it a filename, and tell Python that you want to write to it.

If you don't expressly tell Python that you want to write to a file, it will be opened in read-only mode. This acts as a safety feature to prevent you from accidentally overwriting files. In addition to the standard w to indicate writing and r for reading, Python supports several other file access modes:

  • a: Appends all output to the end of the file; it does not overwrite information currently present. If the indicated file does not exist, it is created.
  • r: Opens a file for input (reading). If the file does not exist, an IOError exception is raised.
  • r+: Opens a file for input and output. If the file does not exist, causes an IOError exception.
  • w: Opens a file for output (writing...