importquantitiesaspqvelocity=3*pq.m/pq.stime=2*pq.sdistance=velocity.copy()distance*=time# <--- this is the problematic part, if we write distance = distance * time, things work as expected even using numpy>=2n_centimeters=distance.rescale(pq.centimeter)print(n_centimeters)n_cm_ul=n_centimeters.magnitude.item()assertisinstance(n_cm_ul,float)err=n_cm_ul-300*2print(f"{err=}")assertabs(err)<1e-12

(cpython-v3.13-apt-deb) 13:38 root@argus:/home/bjorn/vc/chempy# python regression_quantities2.py 600.0 cmerr=0.0(cpython-v3.13-apt-deb) 13:38 root@argus:/home/bjorn/vc/chempy# pip install 'numpy>2'Collecting numpy>2  Downloading numpy-2.3.1-cp313-cp313-manylinux_2_28_x86_64.whl.metadata (62 kB)Downloading numpy-2.3.1-cp313-cp313-manylinux_2_28_x86_64.whl (16.6 MB)   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 16.6/16.6 MB 48.0 MB/s eta 0:00:00Installing collected packages: numpy  Attempting uninstall: numpy    Found existing installation: numpy 1.26.4    Uninstalling numpy-1.26.4:      Successfully uninstalled numpy-1.26.4Successfully installed numpy-2.3.1(cpython-v3.13-apt-deb) 13:38 root@argus:/home/bjorn/vc/chempy# python regression_quantities2.py Traceback (most recent call last):  File "/opt-3/cpython-v3.13-apt-deb/lib/python3.13/site-packages/quantities/quantity.py", line 216, in rescale    cf = get_conversion_factor(from_u, to_u)  File "/opt-3/cpython-v3.13-apt-deb/lib/python3.13/site-packages/quantities/quantity.py", line 52, in get_conversion_factor    assert from_u.dimensionality == to_u.dimensionality           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^AssertionErrorDuring handling of the above exception, another exception occurred:Traceback (most recent call last):  File "/home/bjorn/vc/chempy/regression_quantities2.py", line 6, in <module>    n_centimeters = distance.rescale(pq.centimeter)  File "/opt-3/cpython-v3.13-apt-deb/lib/python3.13/site-packages/quantities/quantity.py", line 218, in rescale    raise ValueError(    ...<2 lines>...    )ValueError: Unable to convert between units of "m/s" and "cm"

my_dict[key]*=other

my_dict[key]=my_dict[key]*other# <--- works with current released quantities & numpy>=2