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by oskarkk 893 days ago
Well, for Python the language reference in the docs[0] is the specification, and many things there are described as CPython implementation details. Like: "CPython implementation detail: For CPython, id(x) is the memory address where x is stored." And as another example, dicts remembering insertion order was CPython's implementation detail in 3.6, but from 3.7 it's part of the language.

[0] https://docs.python.org/3/reference/index.html