Using pydantic? #5707

starpit · 2025-04-17T10:33:24Z

starpit
Apr 17, 2025

Importing pydantic seems to be problematic, possibly because pydantic_core is a native module: _pydantic_core.cpython-312-darwin.so. What approach is suggested for these scenarios? Must one manually use the vm.add_native_module() API for these? I was expecting the rustpython loader to handle these transparently, but this does not appear to be the case?

Thanks!

rustpython -c 'import pydantic'
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "...venv/lib/python3.12/site-packages/pydantic/__init__.py", line 5, in <module>
    from ._migration import getattr_migration
  File "...venv/lib/python3.12/site-packages/pydantic/_migration.py", line 4, in <module>
    from .version import version_short
  File "...venv/lib/python3.12/site-packages/pydantic/version.py", line 5, in <module>
    from pydantic_core import __version__ as __pydantic_core_version__
  File "...venv/lib/python3.12/site-packages/pydantic_core/__init__.py", line 6, in <module>
    from ._pydantic_core import (
ModuleNotFoundError: No module named 'pydantic_core._pydantic_core'

starpit · 2025-04-17T10:53:47Z

starpit
Apr 17, 2025
Author

More detail, collected with -vv:

# code object from ...venv/lib/python3.12/site-packages/pydantic_core/__init__.py
# created '...venv/lib/python3.12/site-packages/pydantic_core/__pycache__/__init__.rustpython-01.pyc'
# trying ...venv/lib/python3.12/site-packages/pydantic_core/_pydantic_core.py
# trying ...venv/lib/python3.12/site-packages/pydantic_core/_pydantic_core.pyc
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "_frozen_importlib", line 1461, in __import__
  File "_frozen_importlib", line 1382, in _gcd_import
  File "_frozen_importlib", line 1352, in _find_and_load
  File "_frozen_importlib", line 1355, in _find_and_load
  File "_frozen_importlib", line 1329, in _find_and_load_unlocked
  File "_frozen_importlib", line 1326, in _find_and_load_unlocked
  File "_frozen_importlib", line 1326, in _find_and_load_unlocked
  File "_frozen_importlib", line 945, in _load_unlocked
  File "_frozen_importlib", line 943, in _load_unlocked
  File "_frozen_importlib", line 936, in _load_unlocked
  File "_frozen_importlib", line 930, in _load_unlocked
  File "_frozen_importlib_external", line 994, in exec_module
  File "_frozen_importlib", line 488, in _call_with_frames_removed
  File "...venv/lib/python3.1
2/site-packages/pydantic_core/__init__.py", line 6, in <module>
    from ._pydantic_core import (
  File "_frozen_importlib", line 1465, in __import__
  File "_frozen_importlib", line 1382, in _gcd_import
  File "_frozen_importlib", line 1352, in _find_and_load
  File "_frozen_importlib", line 1355, in _find_and_load
  File "_frozen_importlib", line 1319, in _find_and_load_unlocked

0 replies

youknowone · 2025-04-17T11:00:10Z

youknowone
Apr 17, 2025
Maintainer

vm.add_native_module() is desinged to load rust-written libraries. It won't work.
Currently RustPython only supports pure python libraries.

0 replies

arihant2math · 2025-04-17T14:40:54Z

arihant2math
Apr 17, 2025
Collaborator

To clarify this pydantic_core is written in rust, but uses the C-api to communicate/register it’s module. I will get module loading working in #5604 at some point, but it’s likely not going to be complete enough for pydantic_core to be used (atleast for a bit).

2 replies

arihant2math Apr 17, 2025
Collaborator

Note that older versions of pydantic are pure-python consider downgrading by 1 major version.

starpit Apr 17, 2025
Author

thanks for the info!

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