PYTHON-5817 - Add "Project Structure and Asyncio Considerations" section to CONTRIBUTING.md#2788
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NoahStapp merged 6 commits intomongodb:masterfrom May 6, 2026
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Pull request overview
Updates the contributor documentation to better explain how the PyMongo codebase is organized around generated synchronous code and the asyncio-first source tree.
Changes:
- Renames and expands the “Asyncio considerations” section into “Project Structure and Asyncio Considerations”.
- Documents the
synchropre-commit hook workflow and where contributors should make changes to avoid overwrites. - Adds guidance on top-level re-export modules and shared vs non-generated modules.
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| PyMongo's source code is located in the `pymongo` directory and is further divided into the `pymongo/asynchronous` and `pymongo/synchronous` subdirectories. | ||
| All files in the `synchronous` subdirectory are generated from the `asynchronous` subdirectory using the `synchro` pre-commit hook, which uses [unasync](https://github.com/python-trio/unasync/) and some custom transforms. |
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The statement that “PyMongo's source code is located in the pymongo directory” is misleading in this repo: there is also source under bson/ and gridfs/, and synchro also generates gridfs/synchronous (and synced test files) from async sources. Consider clarifying that this paragraph is specifically about the pymongo/ package layout, or expand it to mention the other generated async/sync trees as well.
Suggested change
| PyMongo's source code is located in the `pymongo` directory and is further divided into the `pymongo/asynchronous` and `pymongo/synchronous` subdirectories. | |
| All files in the `synchronous` subdirectory are generated from the `asynchronous` subdirectory using the `synchro` pre-commit hook, which uses [unasync](https://github.com/python-trio/unasync/) and some custom transforms. | |
| This section describes the layout of the `pymongo/` package. The repository also contains source code in top-level directories such as `bson/` and `gridfs/`. | |
| Within `pymongo/`, the code is further divided into the `pymongo/asynchronous` and `pymongo/synchronous` subdirectories. Files in `pymongo/synchronous` are generated from `pymongo/asynchronous` using the `synchro` pre-commit hook, which uses [unasync](https://github.com/python-trio/unasync/) and some custom transforms. `synchro` also generates other synchronous trees, such as `gridfs/synchronous`, as well as synced test files. |
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I agree with this suggestion minus the additional context of gridfs and bson.
Jibola
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May 4, 2026
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| PyMongo's source code is located in the `pymongo` directory and is further divided into the `pymongo/asynchronous` and `pymongo/synchronous` subdirectories. | ||
| All files in the `synchronous` subdirectory are generated from the `asynchronous` subdirectory using the `synchro` pre-commit hook, which uses [unasync](https://github.com/python-trio/unasync/) and some custom transforms. |
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I agree with this suggestion minus the additional context of gridfs and bson.
Co-authored-by: Jib <Jibzade@gmail.com>
Co-authored-by: Jib <Jibzade@gmail.com>
Jibola
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May 6, 2026
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…ion to CONTRIBUTING.md (mongodb#2788) Co-authored-by: Jib <Jibzade@gmail.com>
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PYTHON-5817
Changes in this PR
Update the existing "Asyncio considerations" section with a more detailed and expanded "Project Structure and Asyncio Considerations" section.
Test Plan
N/A. Documentation changes only.
Checklist
Checklist for Author
[ ] Did you update the changelog (if necessary)?[ ] Is there test coverage?[ ] Is any followup work tracked in a JIRA ticket? If so, add link(s).Checklist for Reviewer