Qt causes Python's Py_Main to no-op on Windows
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Description
Bug report
There is a a very weird bug with Python 3.10.4 and Qt (both 5.15.2 and 6.3.0) such that if you reference any non-trivial Qt classes or methods (such as qIsFinite, QString, or QVector) on Windows, trying to call Py_Main (or Py_BytesMain) will result in a no-op (the program will immediately exit 0 and not show the Python interactive shell). Furthermore, the bug is absent on MacOS. I have linked a minimal example of the bug at https://github.com/Landmaster/python-embed-qt-bug. The corresponding bug report on the QT side is at https://bugreports.qt.io/browse/QTBUG-103734.
Your environment
- CPython versions tested on: 3.10.4
- Operating system and architecture: Windows 11
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the linked minimal example on Windows 11 using CPython 3.10.4 and Qt 5.15.2 or 6.3.0, comparing Py_Main and Py_BytesMain with and without non-trivial Qt references. Read the linked QTBUG-103734 report and determine the cause; done means the embedded program no longer exits silently instead of showing the interactive shell.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- operating-systems
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100