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Learning Cython Programming (Second Edition)

Learning Cython Programming (Second Edition) - Second Edition

By : Philip Herron
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Learning Cython Programming (Second Edition)

Learning Cython Programming (Second Edition)

1 (1)
By: Philip Herron
Buy this Book

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 (8 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Cython Won't Bite
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1. Cython Won't Bite
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Installing Cython
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Getting started – Hello World
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Summary
2
2. Understanding Cython
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2. Understanding Cython
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Linking models
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Cython keyword – cdef
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Typedef and function pointers
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The public keyword
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Keyword cpdef
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Logging from C/C++ into Python
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Using Python ConfigParser from C/C++
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Callbacks from Python to C/C++
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Cython PXD
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Integration with build systems
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Summary
3
3. Extending Applications
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3. Extending Applications
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Cython pure Python code
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Compiling pure Python code
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Python garbage collector
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Extending Tmux
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Embedding Python
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Cythonizing struct cmd_entry
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Implementing a Tmux command
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Hooking everything together
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Summary
4
4. Debugging Cython
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4. Debugging Cython
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Using GDB with Cython
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Cython caveats
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Summary
5
5. Advanced Cython
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5. Advanced Cython
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Cython and C++
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C++ new and del keyword
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Overloading
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Templates
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Static class member attribute
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Calling C++ functions – Caveat
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Python distutils
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Python threading and GIL
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Cython keywords
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Messaging server
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Caveat on GIL
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Unit testing the native code
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Preventing subclassing
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Parsing large amounts of data
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Summary
6
6. Further Reading
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6. Further Reading
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Overview
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OpenMP support
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Compile time preprocessor
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Python 3
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PyPy
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AutoPXD
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Pyrex and Cython
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SWIG and Cython
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Cython and NumPy
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Numba versus Cython
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Parakeet and Numba
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Relevant Links
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Summary
7
Index
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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...

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Learning Cython Programming (Second Edition)
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