A better JSON check_circular
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- Dominant language
- Python
- Stars
- 77.2k
- Forks
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Description
Feature or enhancement
Proposal:
json.dump(check_circular=True) uses a dictionary to track all objects already visited and creates keys with PyLong_FromVoidPtr. There is another solution for recursive container types in CPython already: Py_ReprEnter and Py_ReprLeave.
I have a patch to replace the dictionary and custom object tracking with the CPython functions and that removes some code and also avoids allocating Long objects for each recursive call.
Has this already been discussed elsewhere?
No response given
Links to previous discussion of this feature:
No response
Linked PRs
- gh-137104
- gh-137286
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 by reviewing json.dump(check_circular=True) and the existing Py_ReprEnter/Py_ReprLeave mechanisms, then inspect linked PRs gh-137104 and gh-137286. Done means the proposed tracking approach preserves recursive-container behavior while removing the dictionary and per-call PyLong_FromVoidPtr allocations.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- c, python
- Domain
- backend
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 25/100