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Re:CPython internals: A ten-hour codewalk through the Python... by saurabhjha on Thursday March 09, 2017 @12:51AM (#13827298)
Not a prep course, but for example Redis has a very good source code overview here https://github.com/antirez/redis#redis-internals

More remarkable is the fact that antirez updated the documentation in response to a post in Reddit. https://www.reddit.com/r/redis/comments/3re0aw/any_pointers_... Thank you antirez! :-)

Re:CPython internals: A ten-hour codewalk through the Python... by gens on Thursday March 09, 2017 @04:57AM (#13828269)
Also check out libpng's source.

https://github.com/glennrp/libpng

Re:CPython internals: A ten-hour codewalk through the Python... by Twirrim on Thursday March 09, 2017 @11:50AM (#13830505)
Oh wow. That's beautifully done. Simple comments that explain clearly what the code is doing, pretty clear choice of variable names so little head-scratching going on.
Re:CPython internals: A ten-hour codewalk through the Python... by Karupan on Thursday March 09, 2017 @03:02AM (#13827835)
The documentation of redis is really good for a large open source project. I am not a contributor, but still read the source code from time to time. Full credit to antirez for taking the time to make it easy to contribute to redis!