From dc8e2b30c58982be49c56802c7af57ee4df500c8 Mon Sep 17 00:00:00 2001
From: Tian Gao <gaogaotiantian@hotmail.com>
Date: Sat, 4 Nov 2023 14:07:39 -0700
Subject: [PATCH 1/3] Avoid executing code in except block in cmd

---
 Lib/cmd.py           |  5 ++---
 Lib/test/test_pdb.py | 25 +++++++++++++++++++++++++
 2 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/Lib/cmd.py b/Lib/cmd.py
index 88ee7d3ddc46944..e933b8dbc1470a8 100644
--- a/Lib/cmd.py
+++ b/Lib/cmd.py
@@ -210,9 +210,8 @@ def onecmd(self, line):
         if cmd == '':
             return self.default(line)
         else:
-            try:
-                func = getattr(self, 'do_' + cmd)
-            except AttributeError:
+            func = getattr(self, 'do_' + cmd, None)
+            if func is None:
                 return self.default(line)
             return func(arg)
 
diff --git a/Lib/test/test_pdb.py b/Lib/test/test_pdb.py
index 5fef8365f597101..1d4d864efc54b5a 100644
--- a/Lib/test/test_pdb.py
+++ b/Lib/test/test_pdb.py
@@ -2327,6 +2327,31 @@ def test_pdb_issue_gh_108976():
     (Pdb) continue
     """
 
+
+def test_pdb_issue_gh_80731():
+    """See GH-80731
+
+    pdb should correctly print exception info if in an except block.
+
+    >>> with PdbTestInput([  # doctest: +ELLIPSIS
+    ...     'import sys',
+    ...     'sys.exc_info()',
+    ...     'continue'
+    ... ]):
+    ...     try:
+    ...         raise ValueError('Correct')
+    ...     except ValueError:
+    ...         import pdb; pdb.Pdb(nosigint=True, readrc=False).set_trace()
+    ...         pass
+    > <doctest test.test_pdb.test_pdb_issue_gh_80731[0]>(10)<module>()
+    -> pass
+    (Pdb) import sys
+    (Pdb) sys.exc_info()
+    (<class 'ValueError'>, ValueError('Correct'), <traceback object at ...>)
+    (Pdb) continue
+    """
+
+
 def test_pdb_ambiguous_statements():
     """See GH-104301
 

From ad01f11a178e37ccb7226ae230ce5b04af079cc0 Mon Sep 17 00:00:00 2001
From: "blurb-it[bot]" <43283697+blurb-it[bot]@users.noreply.github.com>
Date: Sat, 4 Nov 2023 21:12:28 +0000
Subject: [PATCH 2/3] =?UTF-8?q?=F0=9F=93=9C=F0=9F=A4=96=20Added=20by=20blu?=
 =?UTF-8?q?rb=5Fit.?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../next/Library/2023-11-04-21-12-27.gh-issue-80731.Wq51xg.rst   | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 Misc/NEWS.d/next/Library/2023-11-04-21-12-27.gh-issue-80731.Wq51xg.rst

diff --git a/Misc/NEWS.d/next/Library/2023-11-04-21-12-27.gh-issue-80731.Wq51xg.rst b/Misc/NEWS.d/next/Library/2023-11-04-21-12-27.gh-issue-80731.Wq51xg.rst
new file mode 100644
index 000000000000000..5f957a39b2e34b4
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2023-11-04-21-12-27.gh-issue-80731.Wq51xg.rst
@@ -0,0 +1 @@
+Avoid executing the default function in :class:`cmd.Cmd` in an except block

From 23eb43b4129be858da667caad96eb1e16d4ff6d3 Mon Sep 17 00:00:00 2001
From: Tian Gao <gaogaotiantian@hotmail.com>
Date: Mon, 6 Nov 2023 13:18:52 -0800
Subject: [PATCH 3/3] Add test in test_cmd as well

---
 Lib/test/test_cmd.py | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Lib/test/test_cmd.py b/Lib/test/test_cmd.py
index 28f80766677e592..951336fa08542d2 100644
--- a/Lib/test/test_cmd.py
+++ b/Lib/test/test_cmd.py
@@ -244,6 +244,21 @@ def test_input_reset_at_EOF(self):
              "(Cmd) *** Unknown syntax: EOF\n"))
 
 
+class CmdPrintExceptionClass(cmd.Cmd):
+    """
+    GH-80731
+    cmd.Cmd should print the correct exception in default()
+    >>> mycmd = CmdPrintExceptionClass()
+    >>> try:
+    ...     raise ValueError("test")
+    ... except ValueError:
+    ...     mycmd.onecmd("not important")
+    (<class 'ValueError'>, ValueError('test'))
+    """
+
+    def default(self, line):
+        print(sys.exc_info()[:2])
+
 def load_tests(loader, tests, pattern):
     tests.addTest(doctest.DocTestSuite())
     return tests