[issue38765] `ast.AST._attributes` is used by `ast.dump()` but not documented

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

A leading underscore usually means that the name is private and should not be relied on.  We of course use private names to implement public objects, else they should not exist.  '_fields' is an exception, and I leave it to the ast experts to decide if '_attributes' should be also.

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nosy: +terry.reedy

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<https://bugs.python.org/issue38765>
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