python / python/cpython

Incorrect module suggestions when using `-S`

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stdlib type-bug
Dominant language
Python
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Description

Bug report

Bug description:

Here are two mistake in traceback suggest modules:

  1. -S will skip not only site-packages initialization but also module suggesting which is not .
  2. One finder raise an Exception in discover will affect the whole suggestion.

The PR is ready soon.

CPython versions tested on:

3.15, CPython main branch

Operating systems tested on:

Windows

Linked PRs
  • gh-146626

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

Start by reproducing the traceback module-suggestion behavior on CPython 3.15 on Windows, comparing normal startup with -S. Read the traceback suggestion path and its finder discover handling, then verify that both reported cases are covered by tests and no longer affect unrelated suggestions.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
backend
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
20/100

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