April 2017
Intermediate to advanced
769 pages
21h 56m
English
Content preview from Python in a Nutshell, 3rd Edition
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Chapter 4. Object-Oriented Python
Python is an object-oriented (OO) programming language. Unlike some other object-oriented languages, Python doesn’t force you to use the object-oriented paradigm exclusively: it also supports procedural programming with modules and functions, so you can select the best paradigm for each part of your program. The object-oriented paradigm helps you group state (data) and behavior (code) together in handy packets of functionality. It’s also useful when you want to use some of Python’s object-oriented mechanisms covered in this chapter, such as inheritance or special methods. The procedural paradigm, based on modules and functions, may be simpler and more suitable when you don’t need the pluses of object-oriented programming. With Python, you can mix and match paradigms.
Python today has an object model different from that of many years ago. This chapter exclusively describes the so-called new-style, or new object model, which is simpler, more regular, more powerful, and the one we recommend you always use; whenever we speak of classes or instances, we mean new-style classes or instances. However, for backward compatibility, the default object model in v2 is the legacy object model, also known as the classic or old-style object model; the new-style object model is the only one in v3. For legacy information about the old style, see some ancient online docs from 2002.
This chapter also covers special methods, in “Special Methods”, and advanced concepts ...
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