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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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