Bug#896361: python-quantities: quantities fails to import

[Helmut Grohne]

Package: python-quantities
Version: 0.10.1-1
Severity: serious
User: helmutg at debian.org
Usertags: python-import

After installing python-quantities importing the module quantities
into a python interpreter fails with the following error:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python2.7/dist-packages/quantities/__init__.py", line 283, in <module>
    from .units import *
  File "/usr/lib/python2.7/dist-packages/quantities/units/__init__.py", line 9, in <module>
    from . import acceleration
  File "/usr/lib/python2.7/dist-packages/quantities/units/acceleration.py", line 7, in <module>
    from .time import s
  File "/usr/lib/python2.7/dist-packages/quantities/units/time.py", line 18, in <module>
    aliases=['milliseconds']
  File "/usr/lib/python2.7/dist-packages/quantities/unitquantity.py", line 62, in __new__
    ret._conv_ref = definition._reference
  File "/usr/lib/python2.7/dist-packages/quantities/quantity.py", line 139, in _reference
    rq = rq * u._reference**d
  File "/usr/lib/python2.7/dist-packages/quantities/unitquantity.py", line 230, in __pow__
    return self.view(Quantity).__pow__(other)
  File "/usr/lib/python2.7/dist-packages/quantities/quantity.py", line 88, in g
    return f(self, other, *args)
  File "/usr/lib/python2.7/dist-packages/quantities/quantity.py", line 321, in __pow__
    return super(Quantity, self).__pow__(other)
  File "/usr/lib/python2.7/dist-packages/quantities/quantity.py", line 236, in __array_prepare__
    """
ValueError: ufunc %r not supported by quantities
                please file a bug report at https://github.com/python-quantities
                

The vast majority of import failures is attributed to missing dependencies.
Often times that manifests as an ImportError or ModuleNotFoundError.
Typically, dependencies should be inserted by dh-python via ${python:Depends}
or ${python3:Depends}. Thus a missing dependency can be caused by incomplete
install_requires in setup.py. Sometimes a missing dependency of a dependency
is the cause, in such cases this bug should be reassigned.

Helmut