pdb: can't debug a script with arguments

[Jamim]

Bug report

Bug description:

Hello everyone,

With Python 3.13, pdb doesn't pass arguments like -b or --bar to a script while it works fine with Python 3.12.

test.py

import sys

print(' '.join(sys.argv))

✅ Good:

$ python3.13 -m pdb -c continue -c quit test.py foo
test.py foo
The program finished and will be restarted

🐛 Bad:

$ python3.13 -m pdb -c continue -c quit test.py foo --bar
usage: pdb [-h] [-c command] (-m module | pyfile) [args ...]
pdb: error: unrecognized arguments: --bar

✅ Good:

$ python3.12 -m pdb -c continue -c quit test.py foo --bar
test.py foo --bar
The program finished and will be restarted

Best regards!

CPython versions tested on:

3.13

Operating systems tested on:

Linux

Linked PRs

• gh-125115: Pass unknown pdb command line args to script instead of fail #125424
• [3.13] gh-125115: Pass unknown pdb command line args to script instead of fail (GH-125424) #125547

[gaogaotiantian]

Yes that's a bug when pdb switched to argparse. I'll fix it but It would be in the next 3.13 release. In the meantime, you should be able to explicitly pass the argument to the script instead of pdb by ./python -m pdb -c continue -c quit -- test.py foo --bar

[gaogaotiantian]

Fixed in #125424