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

首先阅读提案、链接的讨论以及链接的 PR gh-122124 和 gh-122125。确定新的开发构建指示器应如何纳入 sys.version_info，同时保留五字段序列解包；当该行为实现完成并由相关 CPython 测试覆盖时，这项工作就完成了。