From: Bruce L. <bru...@gm...> - 2014-05-09 20:53:50
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Good morning .. I have an iMac 7.1 running OS X Mavericks and use Enthought Canopy to run Python. I want to use Python to read data from and write data to USB ports. I have used MacPorts to install PyUSB and libusb using their portfiles. >From Idle I have run... import usb.core import usb.util dev = usb.core.find(find_all=True) and receive the following error... Traceback (most recent call last): File "<pyshell#5>", line 1, in <module> dev = usb.core.find(find_all=True) File "/Library/Python/2.7/site-packages/usb/core.py", line 867, in find raise ValueError('No backend available') ValueError: No backend available I have trawled through the various web sites that identify this error and I have been unable to resolve the problem. Does anyone please have a solution? Thanks ... Bruce |