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Improved 'Making Good PRs' section to improve clarity and maintainability. #1510
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@@ -183,59 +183,93 @@ message. It is usually okay to leave that as-is and close the editor. | |||||
See `the merge command's documentation <https://git-scm.com/docs/git-merge>`_ | ||||||
for a detailed technical explanation. | ||||||
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.. _good-prs: | ||||||
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Making good PRs | ||||||
Making Good PRs | ||||||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Please retain sentence case: https://devguide.python.org/documentation/style-guide/#capitalization
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Same applies to the headers below. |
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=============== | ||||||
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When creating a pull request for submission, there are several things that you | ||||||
should do to help ensure that your pull request is accepted. | ||||||
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There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. I think the previous introduction was better. |
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#. **Make your change against the right version of Python.** In general all | ||||||
changes are made against the ``main`` branch first. This includes bug fixes. | ||||||
After the change is merged there, it will be :ref:`ported back <branch-merge>` | ||||||
to older :ref:`maintenance releases <branchstatus>` as well. That way we | ||||||
ensure all affected versions are handled. Therefore, basing a new change | ||||||
directly on a maintenance branch is only used in specific circumstances, | ||||||
for instance when that change does not apply to ``main`` or the change | ||||||
requires a different approach in an older Python version compared to | ||||||
``main``. | ||||||
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#. **Make sure to follow Python's style guidelines.** For Python code you | ||||||
should follow :PEP:`8`, and for C code you should follow :PEP:`7`. If you have | ||||||
one or two discrepancies those can be fixed by the core developer who merges | ||||||
your pull request. But if you have systematic deviations from the style guides | ||||||
your pull request will be put on hold until you fix the formatting issues. | ||||||
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.. note:: | ||||||
Pull requests with only code formatting changes are usually rejected. On | ||||||
the other hand, fixes for typos and grammar errors in documents and | ||||||
docstrings are welcome. | ||||||
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There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Why remove this note and replace it with a shorter one? |
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#. **Be aware of backwards-compatibility considerations.** While the core | ||||||
developer who eventually handles your pull request will make the final call on | ||||||
whether something is acceptable, thinking about backwards-compatibility early | ||||||
will help prevent having your pull request rejected on these grounds. Put | ||||||
yourself in the shoes of someone whose code will be broken by the change(s) | ||||||
introduced by the pull request. It is quite likely that any change made will | ||||||
break someone's code, so you need to have a good reason to make a change as | ||||||
you will be forcing someone to update their code. (This obviously does not | ||||||
apply to new classes or functions; new arguments should be optional and have | ||||||
default values which maintain the existing behavior.) If in doubt, have a look | ||||||
at :PEP:`387` or :ref:`discuss <communication>` the issue with experienced | ||||||
developers. | ||||||
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#. **Make sure you have proper tests** to verify your pull request works as | ||||||
expected. Pull requests will not be accepted without the proper tests! | ||||||
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#. **Make sure all tests pass.** The entire test suite needs to | ||||||
:ref:`run <runtests>` **without failure** because of your changes. | ||||||
It is not sufficient to only run whichever test seems impacted by your | ||||||
changes, because there might be interferences unknown to you between your | ||||||
changes and some other part of the interpreter. | ||||||
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#. Proper :ref:`documentation <documenting>` additions/changes should be included. | ||||||
When creating a pull request, following best practices ensures your contribution is **clear, maintainable, and easy to review**. A well-structured PR improves collaboration and speeds up the review process. | ||||||
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1. **Use a Clear and Structured PR Title** | ||||||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Can we keep using
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Also please trim trailing spaces, or install pre-commit to do it for you: https://devguide.python.org/getting-started/setup-building/#install-pre-commit There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. This applies to all points not just this one @swastim01 |
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PR titles often become commit messages, making them **critical for maintainability and searchability**. Follow these guidelines: | ||||||
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**Do:** | ||||||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. See the preview: https://cpython-devguide--1510.org.readthedocs.build/getting-started/pull-request-lifecycle/#making-good-prs Don't blockquote this. Same for "Avoid". |
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- Clearly summarize the change in a concise manner. | ||||||
- Use the **imperative mood** (e.g., "Fix crash in parser" instead of "Fixed a crash in parser"). | ||||||
- Be specific about what is being changed (avoid vague words like "Update" or "Fix"). | ||||||
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**Avoid:** | ||||||
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- "Bug fix" → Too vague. What bug was fixed? | ||||||
- "Update README" → What was updated? Be precise. | ||||||
- "Refactoring" → Explain what was refactored and why. | ||||||
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**Example of a good PR title:** | ||||||
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``Improve error handling in JSON parser to prevent crashes`` | ||||||
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2. **Write a Meaningful PR Description** | ||||||
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Your PR description should provide **clear context** for reviewers. Answer the following questions: | ||||||
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- **What does this PR do?** | ||||||
- **Why is this change necessary?** | ||||||
- **Are there any breaking changes?** | ||||||
- **Does this PR fix any open issues?** (Reference issue numbers if applicable) | ||||||
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Providing detailed descriptions makes the review process **faster and more efficient**. | ||||||
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3. **Make Your Change Against the Right Branch** | ||||||
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Ensure your PR is based on the correct branch: | ||||||
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- **New changes should target the** ``main`` **branch unless they are specific to an older version.** | ||||||
- If a change affects older versions, it will be **backported** after merging. | ||||||
- Only use **maintenance branches** when the change does not apply to ``main`` or requires a different approach. | ||||||
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Refer to :ref:`branch-merge` for more details on how backporting works. | ||||||
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4. **Follow Python's Style Guidelines** | ||||||
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- Python code should follow :PEP:`8`, and C code should follow :PEP:`7`. | ||||||
- Maintainers may **fix minor style issues**, but major deviations can **delay or block merging**. | ||||||
- PRs with **only style changes** are usually rejected unless they fix a formatting error. | ||||||
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.. note:: | ||||||
Fixes for typos and grammar errors in documentation and docstrings are always welcome. | ||||||
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5. **Consider Backward Compatibility** | ||||||
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- Changes should **not break existing code** unless absolutely necessary. | ||||||
- When introducing **new arguments**, provide **default values** to maintain existing behavior. | ||||||
- If unsure, refer to :PEP:`387` or discuss the issue with experienced maintainers in :ref:`communication`. | ||||||
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Think about how your change affects existing users before submitting your PR. | ||||||
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6. **Ensure Proper Testing** | ||||||
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- Every PR should include **appropriate test cases** to validate the changes. | ||||||
- PRs without tests **will not be accepted** unless they are purely documentation changes. | ||||||
- Tests should **cover edge cases** and expected behaviors. | ||||||
- For bug fixes, add a test that **fails without the fix** and **passes after applying it**. | ||||||
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7. **Make Sure All Tests Pass** | ||||||
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- The entire test suite must **run without failures** before submission. | ||||||
- Run ``make test`` or refer to :ref:`runtests` to check for test failures. | ||||||
- Do not submit PRs with failing tests unless the failure is **directly related** to your change. | ||||||
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8. **Keep Documentation Up to Date** | ||||||
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- Any change affecting functionality should include relevant **documentation updates**. | ||||||
- Follow :ref:`documenting` guidelines to ensure consistency in documentation. | ||||||
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Keeping documentation updated ensures clarity for future contributors and users. | ||||||
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By following these best practices, you increase the likelihood of your PR being **quickly reviewed and merged**! | ||||||
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Copyrights | ||||||
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Accidentally removed line