He's missing the 'libusb' rpm....
On a clean centos/7 vagrant box with only pyusb rpm added....
[vagrant@localhost ~]$ python test.py
libc.so.6
None
None
Traceback (most recent call last):
File "f.py", line 6, in <module>
print usb.core.find()
File "/usr/lib/python2.7/site-packages/usb/core.py", line 864, in find
raise ValueError('No backend available')
ValueError: No backend available
After also doing a 'yum install libusb' things look cleaner:
[vagrant@localhost ~]$ python f.py
libc.so.6
libusb-1.0.so.0
libusb-0.1.so.4
None
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