AttributeError: ‘FFI‘ object has no attribute ‘unpack‘

BUG
File “f:\anaconda340\anaconda3\lib\site-packages\pywin32_ctypes-0.2.0-py3.5.egg\win32ctypes\core\ cffi\_system_information.py”, line 28, in _GetWindowsDirectory
return ffi.unpack(buffer, l)
AttributeError: ‘FFI’ object has no attribute ‘unpack’
解决方法
更新相应的库
pip install --upgrade cffi

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