Undeclared dependency on ‘scipy’

[bignose-debian]

After installing ‘maxentropy’, and also ‘six’ (because of issue #1) and ‘numpy’ (because of issue #2):

$ python3 -m pip install six numpy maxentropy
Collecting six
  Using cached six-1.10.0-py2.py3-none-any.whl
Collecting numpy
  Using cached numpy-1.13.1-cp36-cp36m-manylinux1_x86_64.whl
Collecting maxentropy
Installing collected packages: six, numpy, maxentropy
Successfully installed maxentropy-0.2.3 numpy-1.13.1 six-1.10.0

it fails to import:

$ python3 -c 'import maxentropy'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/home/bignose/bayesml/lib/python3.6/site-packages/maxentropy/__init__.py", line 84, in <module>
    from .basemodel import BaseModel
  File "/home/bignose/bayesml/lib/python3.6/site-packages/maxentropy/basemodel.py", line 10, in <module>
    from scipy import optimize
ModuleNotFoundError: No module named 'scipy'

The Distutils metadata has not declared this dependency.