8000 bpo-20853: fixed PDB's args and retval commands to handle objects with broken repr() by akulakov · Pull Request #28400 · python/cpython · GitHub
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bpo-20853: fixed PDB's args and retval commands to handle objects with broken repr() #28400

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bpo-20853: fixed PDB's args and retval commands to handle objects with broken repr() #28400

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34c945b
fix args and retval commands to handle objects with broken repr()
akulakov Sep 17, 2021
5d12a8c
fix news entry
akulakov Sep 17, 2021
d2a6d61
add comment to the test
akulakov Sep 17, 2021
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4 changes: 3 additions & 1 deletion Doc/library/pdb.rst
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10000
Original file line number Diff line number Diff line change
Expand Up @@ -543,7 +543,9 @@ can be overridden by the local file.

.. pdbcommand:: retval

Print the return value for the last return of a function.
Print the return value for the last return of a function. This command must
be used immediately after the return line is executed; *return* command can
be used to jump to the location where *retval* can be used.

.. rubric:: Footnotes

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12 changes: 10 additions & 2 deletions Lib/pdb.py
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Expand Up @@ -1230,7 +1230,12 @@ def do_args(self, arg):
for i in range(n):
name = co.co_varnames[i]
if name in dict:
self.message('%s = %r' % (name, dict[name]))
try:
r = dict[name]
repr(r)
except Exception as e:
r = e
self.message('%s = %r' % (name, r))
else:
self.message('%s = *** undefined ***' % (name,))
do_a = do_args
Expand All @@ -1240,7 +1245,10 @@ def do_retval(self, arg):
Print the return value for the last return of a function.
"""
if '__return__' in self.curframe_locals:
self.message(repr(self.curframe_locals['__return__']))
try:
self.message(repr(self.curframe_locals['__return__']))
except:
self._error_exc()
else:
self.error('Not yet returned!')
do_rv = do_retval
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36 changes: 36 additions & 0 deletions Lib/test/test_pdb.py
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Expand Up @@ -429,6 +429,42 @@ def test_pdb_pp_repr_exc():
(Pdb) continue
"""

def test_pdb_bad_repr():
# Note that return of test_function() needs to be assigned to a value;
# otherwise doctest tries to run repr() on it and fails.
"""Test that args/retval commands handle bad repr o CB1E bjects.

>>> class BadRepr:
... def __repr__(self):
... raise AttributeError("'BadRepr' object has no attribute 'foo'")
... def __str__(self):
... return '<BadRepr>'
>>> obj = BadRepr()

>>> def test_function(x):
... import pdb; pdb.Pdb(nosigint=True, readrc=False).set_trace()
... return x

>>> with PdbTestInput([ # doctest: +NORMALIZE_WHITESPACE, +ELLIPSIS
... 'args',
... 'return',
... 'retval',
... 'continue',
... ]):
... x = test_function(obj)
> <doctest test.test_pdb.test_pdb_bad_repr[2]>(3)test_function()
-> return x
(Pdb) args
x = AttributeError("'BadRepr' object has no attribute 'foo'")
(Pdb) return
--Return--
> <doctest test.test_pdb.test_pdb_bad_repr[2]>(3)test_function()...
-> return x
(Pdb) retval
*** AttributeError: 'BadRepr' object has no attribute 'foo'
(Pdb) continue
"""


def do_nothing():
pass
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2021-09-16-22-38-58.bpo-20853.J3kJay.rst
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@@ -0,0 +1,2 @@
In :mod:`pdb`, *args* and *retval* commands were fixed to properly handle
objects for which :func:`repr` raises an exception.
0