I have no idea what's going on here:
import numpy as np
from pint import UnitRegistry
ureg = UnitRegistry()
a = np.arange(2.)
au = a * ureg.m
# Numpy Arrays
print('Numpy (base):', [type(v) for v in a])
print('Numpy (isfinite):', [type(v) for v in a if np.isfinite(v)])
# Quantity
print('Pint (base):', [type(v.magnitude) for v in au]) # ok
print('Pint (isfinite):', [type(v.magnitude) for v in au if np.isfinite(v)]) # Huh?Outputs:
Numpy (base): [<class 'numpy.float64'>, <class 'numpy.float64'>]
Numpy (isfinite): [<class 'numpy.float64'>, <class 'numpy.float64'>]
Pint (base): [<class 'numpy.float64'>, <class 'numpy.float64'>]
Pint (isfinite): [<class 'numpy.ndarray'>, <class 'numpy.ndarray'>]
Why on earth does calling a numpy function modify the Quantity in-place???
The reason this even matters is because this works:
print([format(v, '.0f') for v in au])
while this:
print([format(v, '.0f') for v in au if np.isfinite(v)])
gives me a traceback (due to NumPy not implementing __format__):
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-64-929696747b8d> in <module>()
----> 1 [format(v, '.0f') for v in au if np.isfinite(v)]
<ipython-input-64-929696747b8d> in <listcomp>(.0)
----> 1 [format(v, '.0f') for v in au if np.isfinite(v)]
/Users/rmay/miniconda3/envs/py35/lib/python3.5/site-packages/pint/quantity.py in __format__(self, spec)
139 obj = self
140 return '{0} {1}'.format(
--> 141 format(obj.magnitude, remove_custom_flags(spec)),
142 format(obj.units, spec)).replace('\n', '')
143
TypeError: non-empty format string passed to object.__format__
I have no idea what's going on here:
Outputs:
Why on earth does calling a numpy function modify the Quantity in-place???
The reason this even matters is because this works:
while this:
gives me a traceback (due to NumPy not implementing
__format__):--------------------------------------------------------------------------- TypeError Traceback (most recent call last) <ipython-input-64-929696747b8d> in <module>() ----> 1 [format(v, '.0f') for v in au if np.isfinite(v)] <ipython-input-64-929696747b8d> in <listcomp>(.0) ----> 1 [format(v, '.0f') for v in au if np.isfinite(v)] /Users/rmay/miniconda3/envs/py35/lib/python3.5/site-packages/pint/quantity.py in __format__(self, spec) 139 obj = self 140 return '{0} {1}'.format( --> 141 format(obj.magnitude, remove_custom_flags(spec)), 142 format(obj.units, spec)).replace('\n', '') 143 TypeError: non-empty format string passed to object.__format__