Thanks for the prompt reply ...
libusb is installed in ...
/Library/Python/2.7/site-packages/usb/backend/
which contains the following ...
[image: Inline images 1]
Kind regards ... Bruce
On 10 May 2014 08:22, Wander Lairson Costa <wander.lair...@gmail.com> wrote:
> 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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