Currently, importing spglib results in:

>>> import spglib

A module that was compiled using NumPy 1.x cannot be run in
NumPy 2.2.1 as it may crash. To support both 1.x and 2.x
versions of NumPy, modules must be compiled with NumPy 2.0.
Some module may need to rebuild instead e.g. with 'pybind11>=2.12'.

If you are a user of the module, the easiest solution will be to
downgrade to 'numpy<2' or try to upgrade the affected module.
We expect that some modules will need time to support NumPy 2.

Traceback (most recent call last):  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/usr/lib64/python3.13/_pyrepl/__main__.py", line 6, in <module>
    __pyrepl_interactive_console()
  File "/usr/lib64/python3.13/_pyrepl/main.py", line 59, in interactive_console
    run_multiline_interactive_console(console)
  File "/usr/lib64/python3.13/_pyrepl/simple_interact.py", line 160, in run_multiline_interactive_console
    more = console.push(_strip_final_indent(statement), filename=input_name, _symbol="single")  # type: ignore[call-arg]
  File "/usr/lib64/python3.13/code.py", line 314, in push
    more = self.runsource(source, filename, symbol=_symbol)
  File "/usr/lib64/python3.13/_pyrepl/console.py", line 211, in runsource
    self.runcode(code)
  File "/usr/lib64/python3.13/code.py", line 92, in runcode
    exec(code, self.locals)
  File "<python-input-0>", line 1, in <module>
    import spglib
  File "/usr/lib64/python3.13/site-packages/spglib/__init__.py", line 39, in <module>
    from .spglib import (  # noqa: F401
  File "/usr/lib64/python3.13/site-packages/spglib/spglib.py", line 47, in <module>
    from . import _spglib  # type: ignore[attr-defined]
Traceback (most recent call last):
  File "/usr/lib64/python3.13/site-packages/numpy/core/_multiarray_umath.py", line 44, in __getattr__
    raise ImportError(msg)
ImportError: 
A module that was compiled using NumPy 1.x cannot be run in
NumPy 2.2.1 as it may crash. To support both 1.x and 2.x
versions of NumPy, modules must be compiled with NumPy 2.0.
Some module may need to rebuild instead e.g. with 'pybind11>=2.12'.

If you are a user of the module, the easiest solution will be to
downgrade to 'numpy<2' or try to upgrade the affected module.
We expect that some modules will need time to support NumPy 2.


Traceback (most recent call last):
  File "/usr/lib64/python3.13/site-packages/spglib/spglib.py", line 47, in <module>
    from . import _spglib  # type: ignore[attr-defined]
    ^^^^^^^^^^^^^^^^^^^^^
ImportError: numpy.core.multiarray failed to import

A simple bump and rebuild should fix that

Reproducible: Always





In addition the following error happened when importing:

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<python-input-0>", line 1, in <module>
    import spglib
  File "/usr/lib64/python3.13/site-packages/spglib/__init__.py", line 39, in <module>
    from .spglib import (  # noqa: F401
    ...<34 lines>...
    )
  File "/usr/lib64/python3.13/site-packages/spglib/spglib.py", line 71, in <module>
    raise FileNotFoundError(
        "Spglib C library is not installed and no bundled version was detected"
    )
FileNotFoundError: Spglib C library is not installed and no bundled version was detected

This appears unrelated to NumPy 2.x. But I thought it's worth mentioning.