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13 changes: 7 additions & 6 deletions pint/facets/numpy/quantity.py
Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,7 @@
from ..plain import PlainQuantity, MagnitudeT

from ..._typing import Shape
from ...compat import _to_magnitude, np
from ...compat import _to_magnitude, np, HAS_NUMPY
from ...errors import DimensionalityError, PintTypeError, UnitStrippedWarning
from .numpy_func import (
HANDLED_UFUNCS,
Expand Down Expand Up @@ -115,11 +115,12 @@ def _numpy_method_wrap(self, func, *args, **kwargs):
return value

def __array__(self, t=None) -> np.ndarray:
warnings.warn(
"The unit of the quantity is stripped when downcasting to ndarray.",
UnitStrippedWarning,
stacklevel=2,
)
if HAS_NUMPY and isinstance(self._magnitude, np.ndarray):
warnings.warn(
"The unit of the quantity is stripped when downcasting to ndarray.",
UnitStrippedWarning,
stacklevel=2,
)
return _to_magnitude(self._magnitude, force_ndarray=True)

def clip(self, min=None, max=None, out=None, **kwargs):
Expand Down
7 changes: 6 additions & 1 deletion pint/facets/plain/qto.py
Original file line number Diff line number Diff line change
Expand Up @@ -100,7 +100,9 @@ def to_compact(
<Quantity(10.0, 'millinewton')>
"""

if not isinstance(quantity.magnitude, numbers.Number):
if not isinstance(quantity.magnitude, numbers.Number) and not hasattr(
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Nicer indeed!

quantity.magnitude, "nominal_value"
):
msg = "to_compact applied to non numerical types " "has an undefined behavior."
w = RuntimeWarning(msg)
warnings.warn(w, stacklevel=2)
Expand Down Expand Up @@ -137,6 +139,9 @@ def to_compact(
q_base = quantity.to(unit)

magnitude = q_base.magnitude
# Support uncertainties
if hasattr(magnitude, "nominal_value"):
magnitude = magnitude.nominal_value

units = list(q_base._units.items())
units_numerator = [a for a in units if a[1] > 0]
Expand Down