No module named core

[breqdev]

Traceback (most recent call last):
  File "<pyshell#1>", line 1, in <module>
    import sphero
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/sphero-0.0.1-py3.5.egg/sphero/__init__.py", line 1, in <module>
    from core import Sphero
ImportError: No module named 'core'

Running on macOS (latest). I have installed pyserial.

EDIT: Issue also occurs on my Ubuntu 16.04 LTS (Xenial Xerus) Acer Aspire One netbook.