[pyusb-users] ValueError: No backend available

[Michael H. <mic...@ri...>]

I'm having trouble make pyusb work at all.
When typing usb stuff in interactive mode,
usb.core.find(...) either produces ant empty list
or something that prints as nothing.
\Python27\python search.py
produced ValueError: No backend available .
search.py :
import usb.core
import usb.util
import usb.control
import array
dev = usb.core.find(find_all=True)
print dev
dev = usb.core.find()
dev = usb.core.find(find_all=True, idVendor=0x045e, idProduct=0x0040)  # my
mouse
print dev
dev = usb.core.find(               idVendor=0x045e, idProduct=0x0040)  # my
mouse
print dev
dev = usb.core.find(find_all=True, idVendor=0x03eb, idProduct=0x2141)  #
Atmel ICE
print dev
dev = usb.core.find(               idVendor=0x03eb, idProduct=0x2141)  #
Atmel ICE
print dev

I'm on Windows 10.
A find on libusb produces only files with names beginning libusb0.
How do I make pyusb work?

Michael Hennebry