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bpo-38870: Extend subject of ast.unparse warnings (GH-21053)

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- Mention that some compiler optimizations might not roundtrip
exactly (such as constant tuples and frozensets).

- Add a warning about it might raise RecursionError on very
complex expressions due to recursive unparsing aspect of ast.unparse
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Batuhan Taskaya 2020-06-28 04:11:43 +03:00 • committed by GitHub
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7
Doc/library/ast.rst
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@ -1553,7 +1553,12 @@ and classes for traversing abstract syntax trees:
.. warning:: .. warning::
The produced code string will not necessarily be equal to the original The produced code string will not necessarily be equal to the original
code that generated the :class:`ast.AST` object. code that generated the :class:`ast.AST` object (without any compiler
optimizations, such as constant tuples/frozensets).
.. warning::
Trying to unparse a highly complex expression would result with
:exc:`RecursionError`.
.. versionadded:: 3.9 .. versionadded:: 3.9