python / python/cpython

Breakpoints with multiple files

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stdlib type-bug
Dominant language
Python
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Merged PRs (30d)
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Description

Bug report

Consider the following structure:
a.py (foo())
'- b.py (bar())
meaning that a.py with foo() calls some function from b.py, namely bar().

Now, add a breakpoint to b.py and let the debugging begin. You will see that the debugger seems to simply overlook the breakpoint in b.py. In other words: Breakpoints are only accepted, if the next line to be executed before clicking on "Go" is in the same file.

This is rather bothersome and does work correctly in other IDEs like Qt for C++.

The solution

Please "step down" to a breakpoint by design.

Your environment

  • CPython versions tested on: 3.11.1
  • Operating system and architecture: Windows 10

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce the report on Windows 10 with CPython 3.11.1 using a.py calling bar() in b.py, then follow the debugger's breakpoint and stepping entry points. Confirm that a breakpoint in b.py is reached when execution starts in a.py, and add regression coverage for the expected cross-file behavior.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
devtools
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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