bpo-37022: Fix bug where pdb's do_p/do_pp commands swallow exceptions from repr (GH-18180)

1 files changed, 28 insertions, 0 deletions

diff --git a/Lib/test/test_pdb.py b/Lib/test/test_pdb.py
index 08c0ffa..aa3035b 100644
--- a/Lib/test/test_pdb.py
+++ b/Lib/test/test_pdb.py
@@ -391,6 +391,34 @@ def test_pdb_breakpoints_preserved_across_interactive_sessions():
     (Pdb) continue
     """
 
+def test_pdb_pp_repr_exc():
+    """Test that do_p/do_pp do not swallow exceptions.
+
+    >>> class BadRepr:
+    ...     def __repr__(self):
+    ...         raise Exception('repr_exc')
+    >>> obj = BadRepr()
+
+    >>> def test_function():
+    ...     import pdb; pdb.Pdb(nosigint=True, readrc=False).set_trace()
+
+    >>> with PdbTestInput([  # doctest: +NORMALIZE_WHITESPACE
+    ...     'p obj',
+    ...     'pp obj',
+    ...     'continue',
+    ... ]):
+    ...    test_function()
+    --Return--
+    > <doctest test.test_pdb.test_pdb_pp_repr_exc[2]>(2)test_function()->None
+    -> import pdb; pdb.Pdb(nosigint=True, readrc=False).set_trace()
+    (Pdb) p obj
+    *** Exception: repr_exc
+    (Pdb) pp obj
+    *** Exception: repr_exc
+    (Pdb) continue
+    """
+
+
 def do_nothing():
     pass