I have started to learn something about Python and in the process I studied the import command.
If I understand its usage correctly, the command in question in this thread is looking for the module libusb1 in the usb/backend directory. Looking in that directory I see libusb1.py. Is this what needs to be imported? If so, why would the import command say it cannot be found?
Yes, it tells me you don't have permission to access the USB port. To get permission, push the Help button, and then the Documentation link at the top. Then navigate to "USB Control". Different versions of Linux have different procedures to change permissions.