xlwings - 导入错误

Question

Python 3.5在Mac OS 10.12.2上

导入xlwings模块时，我得到一个：

traceback (most recent call last):
  File "<pyshell#5>", line 1, in <module>
    import xlwings
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/xlwings/__init__.py", line 24, in <module>
    from . import _xlmac as xlplatform
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/xlwings/_xlmac.py", line 10, in <module>
    import aem
ImportError: No module named 'aem'

我已经安装了appscript。

请知道我在这里缺少什么？