A better JSON check_circular

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

首先檢視 json.dump(check_circular=True) 和現有的 Py_ReprEnter/Py_ReprLeave 機制，接著檢查已連結的 PR gh-137104 和 gh-137286。當所提出的追蹤方法在移除 dictionary 和每次呼叫的 PyLong_FromVoidPtr allocations 的同時，仍能保留遞迴容器的行為時，即可視為完成。