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I'm trying to figure out the entire list of possible encodings for a Python source file - that is, encodings that can go in a PEP 263 encoding specification, like # -*- encoding: foo -*-.

Is this list the same as the list given in the documentation for the codecs library, under "Standard Encodings"? If not, where can I find the actual list?

(I know that list is the same as the set of unique values in CPython's /Lib/encodings/aliases.py, or equivalently, the set of filenames in /Lib/encodings/, but again I'm not sure.)

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Yes, the valid encodings for a Python source file are precisely those listed in codecs, at least in CPython.

CPython's tokenizer evaluates the value io.open(<FILE>, "r", -1, <ENCODING>, None, None, False).readline and then uses that function to read lines (source: these lines of CPython's Parser/tokenizer.c). Thus, whichever encodings supported by open() are also supported in the encoding declaration.

See also: Which file encodings are supported for Python 3 source files? and its answers

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