[pyusb-users] No Backend Available

[Steve K. <skr...@ve...>]

This is a widely reported problem which has just been left dangling for 
many people. I have yet to see a complete, meaningful resolution. Almost 
no one mentions what versions of what they are using..

I have libusb-1.0.dll in c:\windows\system32 AND the directory where my 
python script exits. I still get the “No backend available” error.
dev = usb.core.find(backend=backend, find_all=True)
File 
“C:\Users\skranish\AppData\Local\Programs\Python\Python38\lib\site-packages\usb\core.py”, 
line 1297, in find
raise NoBackendError(‘No backend available’)
usb.core.NoBackendError: No backend available

This must be dependent on SOMETHING ELSE that needs to be installed. 
Perhaps in some installations, is installed by default, and in other 
installations it is missing.

Windows 7, Python 3.8 (required for W7)
libusb 1.0.23b7
pyusb 1.1.0