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

Cython keywords

Okay, so how does this affect you and, more importantly, your code? It is important to know what way your code should and/or will execute in a concurrent manner. Without an understanding of this, your debugging will be confusing. There are times when the GIL gets in the way and can cause issues by blocking the execution of your C code from Python or vice versa. Cython allows us to control the GIL with the gil and nogil keywords, which is much simpler by wrapping this state for us:



With gil

PyGILState_Ensure ()

With nogil

PyGILState_Release (state)

I find that it's easier to think of multithreading in Python in terms of blocking and nonblocking the execution. In the next example, we will examine the steps needed to embed a web server into a toy messaging server.