8000 bpo-30637: Improve the docs of ast.parse regarding differences with compile() by pablogsal · Pull Request #28459 · python/cpython · GitHub
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bpo-30637: Improve the docs of ast.parse regarding differences with compile() #28459

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Sep 19, 2021
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bpo-30637: Improve the docs of ast.parse regarding differences with compile() #28459

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13 changes: 13 additions & 0 deletions Doc/library/ast.rst
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Expand Up @@ -1917,6 +1917,19 @@ and classes for traversing abstract syntax trees:
``await`` as variable names. The lowest supported version is
``(3, 4)``; the highest is ``sys.version_info[0:2]``.

If source contains a null character ('\0'), :exc:`ValueError` is raised.

.. warning::
Note that succesfully parsing souce code into an AST object doesn't
guarantee that the source code provided is valid Python code that can
be executed as the compilation step can raise further :exc:`SyntaxError`
exceptions. For instance, the source ``return 42`` generates a valid
AST node for a return statement, but it cannot be compiled alone (it needs
to be inside a function node).

In particular, :func:`ast.parse` won't do any scoping checks, which the
compilation step does.

.. warning::
It is possible to crash the Python interpreter with a
sufficiently large/complex string due to stack depth limitations
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