print dev kommt none
root@dm800:~# python
Python 2.7.2 (default, May 16 2012, 21:22:13)
[GCC 4.6.4 20120303 (prerelease)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import usb.core
>>> idV = 0x04e8
>>> idP = 0x2034
>>> dev = usb.core.find(idVendor=idV, idProduct=idP)
>>> print dev
None