From: Anthony Sottile <asottile@umich.edu>
Date: Mon, 29 Aug 2022 14:05:24 +0000 (-0400)
Subject: ast.parse: check `feature_version` common case first (GH-94640)
X-Git-Tag: v3.12.0a1~534
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=9c2b9348e21a4ba3e995345501898c383972752d;p=thirdparty%2FPython%2Fcpython.git

ast.parse: check `feature_version` common case first (GH-94640)
---

diff --git a/Lib/ast.py b/Lib/ast.py
index ebf4529f79b0..8af6d1ed14db 100644
--- a/Lib/ast.py
+++ b/Lib/ast.py
@@ -40,13 +40,13 @@ def parse(source, filename='<unknown>', mode='exec', *,
     flags = PyCF_ONLY_AST
     if type_comments:
         flags |= PyCF_TYPE_COMMENTS
-    if isinstance(feature_version, tuple):
+    if feature_version is None:
+        feature_version = -1
+    elif isinstance(feature_version, tuple):
         major, minor = feature_version  # Should be a 2-tuple.
         if major != 3:
             raise ValueError(f"Unsupported major version: {major}")
         feature_version = minor
-    elif feature_version is None:
-        feature_version = -1
     # Else it should be an int giving the minor version for 3.x.
     return compile(source, filename, mode, flags,
                    _feature_version=feature_version)