On Mon, Jan 21, 2019 at 5:28 AM charles wilson wrote: > On permissions, I had checked/changed permissions previously but re-checked > and found a missed one in /python3.5/site-packages/usb/backend- happened to > be libusb1.pywhich was flagged - all fixed now
> I had also not checked the /dev/*USB* but did and gave necessary permissions > drwxrwxrwx 3 pi pi 4096 Jan 20 13:31 backend > -rwxrwxrwx 1 pi pi 8739 Jan 20 13:31 control.py > still get the same error diagnostic which still ends usb.core.USBError: > [Errno 13] Access denied (insufficient permissions)" > so basically no change. Charles, The permission issue is with the USB device node under /dev/bus/usb/*/* and not the python library files. It looks like you have messed up all library files permissions now - they need not and should not be writeable for everybody. You'd better reinstall the packages to tidy up. > > Now the interesting bit. I tried running as root > root@raspi3:/home/pi/PyProj# python3.5 pyusb_1.py > Traceback (most recent call last): > File "pyusb_1.py", line 2, in <module> > import usb.core > ImportError: No module named 'usb' > > same result if I simply sudo python3.5 pyusb_1.py > > when I run python3.5 from the terminal and get the python >>> prompt there is > no trouble with 'import' and checking with 'help(usb)' shows the module is > there and accessible. > > Interesting though is that I have the same problem on all linux, so whatever > I did wrong I did it each time. I have tried installing pyusb with PIP and > sudo apt-get but it makes no difference. Note that your Raspberry Pi has both python 2 and python 3 installed. The Debian package "python-usb" is for Python 2 and the package "python3-usb" is for Python 3. Regards, Tormod _______________________________________________ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
