2014-05-09 17:53 GMT-03:00 Bruce Lewis <bruce.g.le...@gmail.com>:
> 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?
>
Where is libusb installed at?
--
Best Regards,
Wander Lairson Costa
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