python - Sending data via USB using PyUSB -

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i need send data via usb using python, i'm using pyusb (http://sourceforge.net/apps/trac/pyusb/) usb port available, , tried send message:

devlist = usb.core.find(find_all=true) dev in devlist:     cfg in dev:         intf in cfg:             sys.stdout.write('\t' + str(intf.binterfacenumber) + ',' + str(intf.balternatesetting) + '\n')             ep in intf:                 sys.stdout.write('\t\t' + str(ep.bendpointaddress) + '\n')                 if ep.bendpointaddress:                     try:                         dev.write(ep.bendpointaddress, 'test', intf.binterfacenumber)                     except exception:                         print "\t\terror : dev.write("+str(ep.bendpointaddress)+", 'test', "+str(intf.binterfacenumber)+")"

the result :

    0,0             129             error : dev.write(129, 'test', 0)     0,1             129             error : dev.write(129, 'test', 0)     0,0             136             error : dev.write(136, 'test', 0)             10             error : dev.write(10, 'test', 0)     1,0             139             error : dev.write(139, 'test', 1)             13             error : dev.write(13, 'test', 1)

without try catch gives:

usb.core.usberror: [errno none] usb_claim_interface: not claim interface 0, invalid configuration 0

what wrong? there best way communicate via usb python? because have found lib

as stated in tutorial:

[...] device not work without setting configuration, if has one! [...]

apparently of times there 1 configuration. assuming configurations different devices, can like:

for dev in devlist:     cfg in dev:          cfg.set()          intf in cfg:

if can't set configuration due "resource busy", you'll need unload interface kernel driver:

dev.detatch_kernel_driver(interface)

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