Book Image

Python 3 Object Oriented Programming

By : Dusty Phillips
Book Image

Python 3 Object Oriented Programming

By: Dusty Phillips

Overview of this book

Object Oriented Programming is a very important aspect of modern programming languages. The basic principles of Object Oriented Programming are relatively easy to learn. Putting them together into working designs can be challenging.This book makes programming more of a pleasure than a chore using powerful Python 3 object-oriented features of Python 3. It clearly demonstrates the core OOP principles and how to correctly implement OOP in Python. Object Oriented Programming ranks high in importance among the many models Python supports. Yet, many programmers never bother learning the powerful features that make this language object oriented.The book teaches when and how OOP should be correctly applied. It emphasizes not only the simple syntax of OOP in Python, but also how to combine these objects into well-designed software.This book will introduce you to the terminology of the object-oriented paradigm, focusing on object-oriented design with step-by-step examples. It will take you from simple inheritance, one of the most useful tools in the object-oriented programmer's toolbox, all the way through to cooperative inheritance, one of the most complicated. You will be able to raise, handle, define, and manipulate exceptions.You will be able to integrate the object-oriented and the not-so-object-oriented aspects of Python. You will also be able to create maintainable applications by studying higher level design patterns. You'll learn the complexities of string and file manipulation, and how Python distinguishes between binary and textual data. Not one, but two very powerful automated testing systems will be introduced to you. You'll understand the joy of unit testing and just how easy they are to create. You'll even study higher level libraries such as database connectors and GUI toolkits and how they apply object-oriented principles.
Table of Contents (18 chapters)
Python 3 Object Oriented Programming
About the Author
About the Reviewers

File IO

So far through this book, when our examples touch files, we've operated entirely on text files. Operating systems, however, actually represent files as a sequence of bytes, not text.

Because reading bytes and converting the data to text is one of the more common operations on files, Python wraps the incoming (or outgoing) stream of bytes with appropriate decode (or encode) calls so we can deal directly with str objects. This saves us a lot of boilerplate code to be constantly encoding and decoding text.

The open() function is used to open a file. For reading text from a file, we only need to pass the filename into the function. The file will be opened for reading, and the bytes will be converted to text using the platform default encoding. As with decode and encode on bytes and str objects, the open function can accept encoding and errors arguments to open a text file in a specific character encoding or to choose a specific replacement strategy for invalid bytes in that encoding. These...