Book Image

Learning Cython Programming (Second Edition) - Second Edition

By : Philip Herron
Book Image

Learning Cython Programming (Second Edition) - Second Edition

By: Philip Herron

Overview of this book

Cython is a hybrid programming language used to write C extensions for Python language. Combining the practicality of Python and speed and ease of the C language it’s an exciting language worth learning if you want to build fast applications with ease. This new edition of Learning Cython Programming shows you how to get started, taking you through the fundamentals so you can begin to experience its unique powers. You’ll find out how to get set up, before exploring the relationship between Python and Cython. You’ll also look at debugging Cython, before moving on to C++ constructs, Caveat on C++ usage, Python threading and GIL in Cython. Finally, you’ll learn object initialization and compile time, and gain a deeper insight into Python 3, which will help you not only become a confident Cython developer, but a much more fluent Python developer too.
Table of Contents (14 chapters)
Learning Cython Programming Second Edition
About the Author
About the Reviewer

Preventing subclassing

If you create an extension type in Cython, something you never want to be subclassed, it is a cpp class wrapped in a Python class. To prevent this, you can do the following:

cimport cython
cdef class A: pass

cdef class B (A): pass

This annotation will give an error when someone tries to subclass:

pycode.pyx:7:5: Base class 'A' of type 'B' is final

Note that these annotations only work on the cdef or cpdef functions and not on normal Python def functions.