Python 3.14 Missing Built-in Modules for Pandas

[machani-paul007]

Bug Description

When using PyO3 0.27.2 with Python 3.14.0, built-in Python modules fail to import, causing cascading failures for any package that depends on them (numpy, pandas, etc.). The same code works correctly with Python 3.13.

Built-in modules like math, _struct, _posixsubprocess, sys, os are missing when Python is initialized via PyO3 with Python 3.14. These are core C extension modules that should always be available.

ModuleNotFoundError: No module named 'math'
ModuleNotFoundError: No module named '_struct'

Is Python 3.14 support experimental in PyO3 0.27.2?
Are there Python 3.14-specific initialization requirements?
Is this a known issue? workarounds any ?
What's the recommended approach?

Steps to Reproduce

Simple Test cases repo to replicate same issue with Pandas.
official whl files are pulled from https://pypi.org/project/pandas/#files

https://github.com/machani-paul007/pyo3-whl-tests

Backtrace

Your operating system and version

Ubuntu v24 LTS

Your Python version (python --version)

py 3.13.10 / py 3.14.0

Your Rust version (rustc --version)

1.91.0

Your PyO3 version

0.27.2

How did you install python? Did you use a virtualenv?

Using uv venv

Additional Info

No response