I'm running Mac OS X 10.8 with python 2.7. I installed libusb with MacPorts and it does work (tested my importing usb.core & usb.util). However, each time I try to access a device, I get the following error: I'm running Mac OS X 10.8 with python 2.7. I in
阅读背景：
在Mac OS X上的libusb -“ValueError:没有后端可用”
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