From 4cd4ca750db56a77e0498d5764e68dce533b261d Mon Sep 17 00:00:00 2001
From: EternalRights <3147268827@qq.com>
Date: Thu, 30 Apr 2026 01:01:50 +0800
Subject: [PATCH 1/2] fix Argument.__repr__ crash when _action is not
 initialized

---
 changelog/13817.bugfix.rst       |  1 +
 src/_pytest/config/argparsing.py |  5 ++++-
 testing/test_parseopt.py         | 25 +++++++++++++++++++++++++
 3 files changed, 30 insertions(+), 1 deletion(-)
 create mode 100644 changelog/13817.bugfix.rst

diff --git a/changelog/13817.bugfix.rst b/changelog/13817.bugfix.rst
new file mode 100644
index 00000000000..438706b0033
--- /dev/null
+++ b/changelog/13817.bugfix.rst
@@ -0,0 +1 @@
+Fixed a secondary `AttributeError` masking the original error when an option argument fails to initialize.
\ No newline at end of file
diff --git a/src/_pytest/config/argparsing.py b/src/_pytest/config/argparsing.py
index 4536709134b..f2ec53374af 100644
--- a/src/_pytest/config/argparsing.py
+++ b/src/_pytest/config/argparsing.py
@@ -306,10 +306,13 @@ def type(self) -> Any | None:
         return self._action.type
 
     def __repr__(self) -> str:
+        action = getattr(self, "_action", None)
+        if action is None:
+            return "Argument(<uninitialized>)"
         args: list[str] = []
         args += ["opts: " + repr(self.names())]
         args += ["dest: " + repr(self.dest)]
-        if self._action.type:
+        if action.type:
             args += ["type: " + repr(self.type)]
         args += ["default: " + repr(self.default)]
         return "Argument({})".format(", ".join(args))
diff --git a/testing/test_parseopt.py b/testing/test_parseopt.py
index f56deed8b5d..8c802617011 100644
--- a/testing/test_parseopt.py
+++ b/testing/test_parseopt.py
@@ -341,3 +341,28 @@ def test_argcomplete(pytester: Pytester, monkeypatch: MonkeyPatch) -> None:
     monkeypatch.setenv("COMP_POINT", str(len("pytest " + arg)))
     result = pytester.run("bash", str(script), arg)
     result.stdout.fnmatch_lines(["test_argcomplete", "test_argcomplete.d/"])
+
+
+def test_argument_repr_uninitialized() -> None:
+    """Argument.__repr__ should not crash if _action is not set yet."""
+    arg = parseopt.Argument.__new__(parseopt.Argument)
+    result = repr(arg)
+    assert result == "Argument(<uninitialized>)"
+
+
+def test_argument_repr_initialized(parser: parseopt.Parser) -> None:
+    """Argument.__repr__ works normally when properly initialized."""
+    parser.addoption("--myflag", dest="myflag", help="test flag")
+    option = parser._anonymous.options[-1]
+    result = repr(option)
+    assert "opts:" in result
+    assert "dest:" in result
+
+
+def test_argument_repr_with_type(parser: parseopt.Parser) -> None:
+    """Argument.__repr__ includes type when set."""
+    parser.addoption("--count", type=int, dest="count", help="count")
+    option = parser._anonymous.options[-1]
+    result = repr(option)
+    assert "type:" in result
+    assert "int" in result

From e786bca51096b60427b1a2503b2ff62b11976c05 Mon Sep 17 00:00:00 2001
From: "pre-commit-ci[bot]"
 <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date: Wed, 29 Apr 2026 17:26:18 +0000
Subject: [PATCH 2/2] [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci
---
 changelog/13817.bugfix.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/changelog/13817.bugfix.rst b/changelog/13817.bugfix.rst
index 438706b0033..08c9a6a53c3 100644
--- a/changelog/13817.bugfix.rst
+++ b/changelog/13817.bugfix.rst
@@ -1 +1 @@
-Fixed a secondary `AttributeError` masking the original error when an option argument fails to initialize.
\ No newline at end of file
+Fixed a secondary `AttributeError` masking the original error when an option argument fails to initialize.