[issue34822] Simplify AST for slices

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

I'm going to review the actual code next.

Regarding the omission of parentheses in various contexts, I am all for that, but I consider it a separate issue (as it only pertains to ast.unparse()). The fix in https://github.com/python/cpython/pull/17892 should go in regardless.

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<https://bugs.python.org/issue34822>
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