TypeError on where command with Python 3.14 (Pdb.print_stack_trace() signature mismatch) #64
Description
Hey,
I'm getting the following error when running the where (w) command under Python 3.14:
TypeError: Pdb.print_stack_trace() takes 1 positional argument but 2 were given
This happens only on Python 3.14 — everything works fine with Python 3.13.9.
Minimal reproduction
# pdbpp_issue.py
print("hello world")Run with Python 3.14:
[2] > /private/tmp/pdbpp_issue.py(1)<module>()
-> print("hello world")
(Pdb++) w
Traceback (most recent call last):
File "/Users/bityob/.local/share/uv/python/cpython-3.14.0-macos-aarch64-none/lib/python3.14/pdb.py", line 3601, in main
pdb._run(target)
~~~~~~~~^^^^^^^^
File "/Users/bityob/.local/share/uv/python/cpython-3.14.0-macos-aarch64-none/lib/python3.14/pdb.py", line 2522, in _run
self.run(target.code)
~~~~~~~~^^^^^^^^^^^^^
File "/Users/bityob/.local/share/uv/python/cpython-3.14.0-macos-aarch64-none/lib/python3.14/bdb.py", line 899, in run
exec(cmd, globals, locals)
~~~~^^^^^^^^^^^^^^^^^^^^^^
File "<string>", line 1, in <module>
File "/private/tmp/pdbpp_issue.py", line 1, in <module>
print("hello world")
^^^^^
File "/Users/bityob/.local/share/uv/python/cpython-3.14.0-macos-aarch64-none/lib/python3.14/bdb.py", line 94, in wrapper
ret = func(frame, *args)
File "/Users/bityob/.local/share/uv/python/cpython-3.14.0-macos-aarch64-none/lib/python3.14/bdb.py", line 130, in line_callback
frame.f_trace(frame, 'line', None)
~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^
File "/Users/bityob/.local/share/uv/python/cpython-3.14.0-macos-aarch64-none/lib/python3.14/bdb.py", line 284, in trace_dispatch
return self.dispatch_line(frame)
~~~~~~~~~~~~~~~~~~^^^^^^^
File "/Users/bityob/.local/share/uv/python/cpython-3.14.0-macos-aarch64-none/lib/python3.14/bdb.py", line 310, in dispatch_line
self.user_line(frame)
~~~~~~~~~~~~~~^^^^^^^
File "/Users/bityob/.local/share/uv/python/cpython-3.14.0-macos-aarch64-none/lib/python3.14/pdb.py", line 547, in user_line
self.interaction(frame, None)
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
File "/Users/bityob/.cache/uv/archive-v0/5EUa02FNRSk9D-sl4qXmF/lib/python3.14/site-packages/pdbpp.py", line 449, in interaction
return self._interaction(frame, tb)
~~~~~~~~~~~~~~~~~^^^^^^^^^^^
File "/Users/bityob/.cache/uv/archive-v0/5EUa02FNRSk9D-sl4qXmF/lib/python3.14/site-packages/pdbpp.py", line 483, in _interaction
self._cmdloop()
~~~~~~~~~~~~~^^
File "/Users/bityob/.local/share/uv/python/cpython-3.14.0-macos-aarch64-none/lib/python3.14/pdb.py", line 601, in _cmdloop
self.cmdloop()
~~~~~~~~~~~~^^
File "/Users/bityob/.local/share/uv/python/cpython-3.14.0-macos-aarch64-none/lib/python3.14/cmd.py", line 149, in cmdloop
stop = self.onecmd(line)
File "/Users/bityob/.local/share/uv/python/cpython-3.14.0-macos-aarch64-none/lib/python3.14/pdb.py", line 1038, in onecmd
return cmd.Cmd.onecmd(self, line)
~~~~~~~~~~~~~~^^^^^^^^^^^^
File "/Users/bityob/.local/share/uv/python/cpython-3.14.0-macos-aarch64-none/lib/python3.14/cmd.py", line 227, in onecmd
return func(arg)
File "/Users/bityob/.local/share/uv/python/cpython-3.14.0-macos-aarch64-none/lib/python3.14/pdb.py", line 1689, in do_where
self.print_stack_trace(count)
~~~~~~~~~~~~~~~~~~~~~~^^^^^^^
TypeError: Pdb.print_stack_trace() takes 1 positional argument but 2 were givenRun with Python 3.13.9 (works as expected):
$ uv run --python 3.13.9 --with pdbpp python -m pdb pdbpp_issue.py
[2] > /private/tmp/pdbpp_issue.py(1)<module>()
-> print("hello world")
(Pdb++) w
[0] .../bdb.py(666)run()
exec(cmd, globals, locals)
[1] <string>(1)<module>()
> [2] /private/tmp/pdbpp_issue.py(1)<module>()
print("hello world")I haven’t had time to dig into it yet, but wanted to report it here so it’s on the radar for future investigation and potential fixes.
Thanks