Python - Sphinx: vague Import error

Question

I am trying to generate API documentation from comments (in numpydoc style) in my project and I am stuck at vague import errors from sphinx:

/home/carbolymer/workspace/si-app/doc/source/scripts.rst:10: WARNING: autodoc: failed to import module 'scripts.backtest'; the following exception was raised:
Traceback (most recent call last):
  File "/usr/lib/python3.5/site-packages/sphinx/ext/autodoc.py", line 547, in import_object
    __import__(self.modname)
  File "/home/carbolymer/workspace/si-app/application/scripts/backtest.py", line 6, in <module>
    from scipy import stats
  File "/usr/lib/python3.5/site-packages/scipy/__init__.py", line 64, in <module>
    from numpy import __version__ as __numpy_version__
ImportError: cannot import name '__version__'
/home/carbolymer/workspace/si-app/doc/source/scripts.rst:18: WARNING: autodoc: failed to import module 'scripts.importdb'; the following exception was raised:
Traceback (most recent call last):
  File "/usr/lib/python3.5/site-packages/sphinx/ext/autodoc.py", line 547, in import_object
    __import__(self.modname)
  File "/home/carbolymer/workspace/si-app/application/scripts/importdb.py", line 5, in <module>
    from si.storage.dataimport import DataImport, database_drivers, sources
  File "/home/carbolymer/workspace/si-app/application/si/storage/dataimport.py", line 6, in <module>
    from si.storage.datasource.file import Stooq as StooqFile
  File "/home/carbolymer/workspace/si-app/application/si/storage/datasource/file.py", line 19, in <module>
    from si.storage.datasource.util import correct_prices
  File "/home/carbolymer/workspace/si-app/application/si/storage/datasource/util.py", line 4, in <module>
    def correct_prices(dataframe, calendar=PolishCalendar()):
  File "/usr/lib/python3.5/unittest/mock.py", line 917, in __call__
    return _mock_self._mock_call(*args, **kwargs)
  File "/usr/lib/python3.5/unittest/mock.py", line 976, in _mock_call
    result = next(effect)
StopIteration

Full log:

http://pastebin.com/tycmVQdN

I've tried mocking numpy.__version__ but it does not work. Also I have no clue what about the lines containing PolishCalendar() - why sphinx is trying to mock this object?

Because of those import errors, these files are missing in the documentation. How can I fix this?

My build command:

make clean ; sphinx-apidoc -a -f -o ./source ../application ; make html

Versions:

$ sphinx-build --version
Sphinx (sphinx-build) 1.5.1
$ python --version                                                        
Python 3.5.2

source/conf.py: http://pastebin.com/VfsiX4uZ