[Python-checkins] bpo-30637: Improve the docs of ast.parse regarding differences with compile() (GH-28459)
pablogsal
webhook-mailer at python.org
Sun Sep 19 18:45:03 EDT 2021
https://github.com/python/cpython/commit/e6d05a4092b4176a30d1d1596585df13c2ab676d
commit: e6d05a4092b4176a30d1d1596585df13c2ab676d
branch: main
author: Pablo Galindo Salgado <Pablogsal at gmail.com>
committer: pablogsal <Pablogsal at gmail.com>
date: 2021-09-19T23:44:51+01:00
summary:
bpo-30637: Improve the docs of ast.parse regarding differences with compile() (GH-28459)
files:
M Doc/library/ast.rst
diff --git a/Doc/library/ast.rst b/Doc/library/ast.rst
index 19e7bcc414b84..e21151bd4ef79 100644
--- a/Doc/library/ast.rst
+++ b/Doc/library/ast.rst
@@ -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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