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
Credits
About the Author
Acknowledgments
About the Reviewer
www.PacktPub.com
Preface
Index

Using GDB with Cython


To debug Cython, you need GDB >= 7.0. On Mac OS X Xcode, build tools have moved to LLVM and lldb as respective debuggers. You can install gdb using homebrew:

$ brew install gdb

We cannot use the Python debugger since the Cython code is compiled down to C/C++. Therefore, when debugging without the Cython plugin, you will be stepping through the generated C/C++ code, which won't be helpful as it won't understand the context of the Cython program.

Running cygdb

Cygdb is installed as a part of Cython and is a wrapper over GDB (it invokes GDB with arguments to set up the Cython plugin). Before you can debug the Cython code, we need to generate the debugging information. Just like C/C++, we need to specify compiler options to generated debuggable code we can pass –gdb when invoking the Cython compiler:

$ cython --gdb cycode.pyx

Note

Before you start debugging on Debian, you need to install the Python debug information package and GDB as it is not installed with build-essential...