Replace `pyvenv.cfg`'s `home` key with `base-prefix` and `base-exec-prefix`

Feature or enhancement

Proposal:

The home key in pyvenv.cfg is used to specify the directory where the base Python executable is. During the Path Initialization, this directory, and consecutively its parents, is searched for stdlib landmarks to determine sys.base_prefix and sys.base_exec_prefix. Naturally, this isn't ideal, it would be better if pyvenv.cfg contained these values directly.

Proposed plan:

• Update venv to start setting the base-prefix and base-exec-prefix keys in pyvenv.cfg when creating/updating environments
• In getpath, use the base-prefix and base-exec-prefix keys to set the prefixes
• Deprecate specifying home, in pyvenv.cfg

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

首先阅读 venv 环境的创建和更新逻辑，然后跟踪 getpath 中的 Path Initialization，以了解 pyvenv.cfg 当前如何确定 sys.base_prefix 和 sys.base_exec_prefix。定义新的 base-prefix 和 base-exec-prefix 键的写入和使用方式，说明如何弃用 home，并验证新创建和已更新的环境。