A Whirlwind Excursion through Python C Extensions
Created 16 February 2009, last updated 28 January 2021 This is a presentation for PyCon 2009 in Chicago. A video of me presenting it is available on pyvideo.org, or at archive.org, or right here: Python can be extended with extensions written in C. It’s a complex topic, this will be a quick 45 minute introduction. The examples here are toys, meant to demonstrate the structure of an extension. They
The structure of .pyc files
I spent some time digging around in the Python code to understand how .pyc files work. It turns out they are fairly simple, then kind of complex. At the simple level, a .pyc file is a binary file containing only three things: A four-byte magic number,A four-byte modification timestamp, andA marshalled code object.The magic number is nothing as cool as cafebabe, it’s simply two bytes that change wi
Coverage.py — Coverage.py 7.4.4 documentation
Coverage.py Coverage.py is a tool for measuring code coverage of Python programs. It monitors your program, noting which parts of the code have been executed, then analyzes the source to identify code that could have been executed but was not. Coverage measurement is typically used to gauge the effectiveness of tests. It can show which parts of your code are being exercised by tests, and which ar
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