Problems with PyUSB in Python 2.7. Do I need LibUSB driver?

Asked Jan 12 '12 at 01:23

Active Mar 24 '12 at 20:15

Viewed 919 times

I installed PyUSB from source for Python 2.7

When I import the module I get no error, but when I try:

printers = usb.core.find(find_all=True, bDeviceClass=7)

dev = usb.core.find(idVendor=0x04d8, idProduct=0x003f)

I get:

TypeError: expected string or Unicode object, NoneType found

I'm able to communicate correctly with this device in C#, and was curious why it doesn't appear in PyUSB.

edited Mar 24 '12 at 20:15

asked Jan 12 '12 at 01:23

David Rinck

You should really tell us which OS you're using. – Mar 24 '12 at 19:55
hey I have the same problem. I am on windows 7. Please help me. – Akhil P Oommen Jun 02 '12 at 08:01

0 Answers0