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Depends on the area of the code you look at, but they can be fairly sparse, yes:

https://github.com/python/cpython/blob/master/PC/python_uwp....

I'd say that redis is probably a better example of gold standard clean C code, though, and they follow the rule of "don't comment unless it's decidedly non-obvious" pretty assiduously:

https://github.com/antirez/redis/blob/unstable/src/ae_epoll....

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Those two files do have a low ratio of comments. However a large number of files in those code bases have quite a lot more comments... I personally don't think these two code bases have sparse comments, overall, although perhaps it's subjective or my bias is affecting my judgement :)

Eg, to me this is well-commented and I wouldn't call it sparse.

https://github.com/antirez/redis/blob/unstable/src/latency.c

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