Python script(win32com, excel) crashes when I edit another open workbook. Is this the expected behavior, can I prevent this?

The error looks like this:

 File "C:\Python27\lib\site-packages\win32com\client\__init__.py", l开发者_Python百科ine 471, i
 __setattr__
    self._oleobj_.Invoke(*(args + (value,) + defArgs))
pywintypes.com_error: (-2147352567, 'Exception occurred.', (0, None, None, None
 0, -2146777998), None)

I'm using office 2007