See the Release Notes here: http://docs.xlwings.org/whatsnew.html#v0-1-1-june-27-2014
About xlwings: xlwings is a BSD-licensed Python library that makes it easy to call Python from Excel and vice versa:
Interact with Excel from Python using a syntax that is close to VBA yet Pythonic. Replace your VBA macros with Python code and still pass around your workbooks as easily as before. xlwings fully supports NumPy arrays and Pandas DataFrames. Currently, it only works on Windows.