From 7f5b142b54b2a04bcb4df358175d079e046c5bf7 Mon Sep 17 00:00:00 2001
From: Sanjay Santhanam <51058514+Sanjays2402@users.noreply.github.com>
Date: Fri, 31 Jul 2026 13:33:49 -0700
Subject: [PATCH] Do not treat a walrus argument as a keyword argument (#242)

Closes #212
---
 parso/python/errors.py     | 3 +++
 test/test_python_errors.py | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/parso/python/errors.py b/parso/python/errors.py
index c51a36d..b498af3 100644
--- a/parso/python/errors.py
+++ b/parso/python/errors.py
@@ -936,6 +936,9 @@ class _ArglistRule(SyntaxRule):
                             self.add_issue(argument, message=message)
                     else:
                         kw_unpacking_only = True
+                elif argument.children[1] == ':=':
+                    # f(a := 1) is a positional argument, not a keyword one.
+                    pass
                 else:  # Is a keyword argument.
                     kw_only = True
                     if first.type == 'name':
diff --git a/test/test_python_errors.py b/test/test_python_errors.py
index a3fdaa1..56795f2 100644
--- a/test/test_python_errors.py
+++ b/test/test_python_errors.py
@@ -366,6 +366,8 @@ def test_valid_fstrings(code):
         'a[(b:=0)]',
         'a[(b:=0, c:=0)]',
         'a[(b:=0):1:2]',
+        'f(a := 1, b)',
+        'f(a := 1, b, c := 2)',
     ]
 )
 def test_valid_namedexpr(code):