Add `devel` field to `sys.version_info`

Feature or enhancement

Proposal:

The idea is to add a new field to sys.version_info to specify if we are on a development build (non-tagged commit). For backwards compatibility, sys.version_info should still only produce a 5-field sequence when unpacking.

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

Discussed in https://discuss.python.org/t/pep-739-static-description-file-for-build-details-of-python-installations/44572/67

Linked PRs

• gh-122124
• gh-122125

先閱讀提案、連結的討論，以及連結的 PR gh-122124 和 gh-122125。判定新的開發組建指示器應如何納入 sys.version_info，同時保留五欄位序列解包；當該行為完成實作並由相關的 CPython 測試涵蓋時，這項工作就完成了。