I enjoyed this quick introduction to the CPython intepreter. Worth watching if you'd like to know more about how CPython is implemented and what exactly the interpreter is doing.
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Could be followed up with Link this dive through the CPython intepreter by Prof Philip Guo, which I've started watching. It's nice to get a better understand of the tools you use everyday, and it makes me very curious about the structure of the other Python implementations: Link PyPy, Link Jython, Link tinypy, Link Skulpt, etc.