[New-bugs-announce] [issue35266] Add _PyPreConfig and rework _PyCoreConfig and _PyMainInterpreterConfig

[STINNER Victor]

New submission from STINNER Victor <vstinner at redhat.com>:

The C code of Python initialization uses _PyCoreConfig and _PyMainInterpreterConfig which co-exist and more or less redundant. For example, both structures have "argv": wchar_** for _PyCoreConfig, PyObject* (list of str) for _PyMainInterpreterConfig.

I propose to put _PyCoreConfig inside _PyMainInterpreterConfig and move wchar_t* strings into a new _PyPreConfig structure.

The main idea is that _PyPreConfig and wchar_* type are only used for early Python initialization, but once Python is initialization, the configuration should be provided as Python objects.

I didn't check all configuration variables to see if it's doable or not, but I wrote a proof-of-concept pull request to show my idea with concrete (and working!) code.

See attached PR.

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components: Interpreter Core
messages: 330005
nosy: eric.snow, ncoghlan, vstinner
priority: normal
severity: normal
status: open
title: Add _PyPreConfig and rework _PyCoreConfig and _PyMainInterpreterConfig
versions: Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35266>
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