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- """
- sympy.polys.matrices.dfm
- Provides the :class:`DFM` class if ``GROUND_TYPES=flint'``. Otherwise, ``DFM``
- is a placeholder class that raises NotImplementedError when instantiated.
- """
- from sympy.external.gmpy import GROUND_TYPES
- if GROUND_TYPES == "flint": # pragma: no cover
- # When python-flint is installed we will try to use it for dense matrices
- # if the domain is supported by python-flint.
- from ._dfm import DFM
- else: # pragma: no cover
- # Other code should be able to import this and it should just present as a
- # version of DFM that does not support any domains.
- class DFM_dummy:
- """
- Placeholder class for DFM when python-flint is not installed.
- """
- def __init__(*args, **kwargs):
- raise NotImplementedError("DFM requires GROUND_TYPES=flint.")
- @classmethod
- def _supports_domain(cls, domain):
- return False
- @classmethod
- def _get_flint_func(cls, domain):
- raise NotImplementedError("DFM requires GROUND_TYPES=flint.")
- # mypy really struggles with this kind of conditional type assignment.
- # Maybe there is a better way to annotate this rather than type: ignore.
- DFM = DFM_dummy # type: ignore
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