python pyusb_python-PyUSB dev.set_configuration()

我正在尝试使用python库PyUSB将数据发送到USB记忆棒.我使用的代码如下：

import usb.core

import usb.util

# find our devices

#dev = usb.core.find(idVendor=0xfffe, idProduct=0x0001)

dev = usb.core.find(idVendor=0x090c, idProduct=0x1000)

# was it found?

if dev is None:

raise ValueError('Device not found')

# set the active configuration. With no arguments, the first

# configuration will be the active one

dev.set_configuration()

# get an endpoint instance

cfg = dev.get_active_configuration()

interface_number = cfg[(0,0)].bInterface_number

alternate_setting = usb.control.get_interface(interface_number)

intf = usb.util.find_descriptor(

cfg, bTnerfaceNumber = interface_number,

bAlternateSettings = alternate_setting

)

ep = usb.util.find_descriptor(

intf,

# match the first OUT endpoint

custom_match = \n lambda e:

usb.util.endpoint_direction(e.bEndpointAddress) == \n usb.util.ENDPOINT_OUT

)

assert ep is not None

# write the data

ep.write('test')

但是我似乎收到以下错误：

Traceback (most recent call last):

File "/home/usman/Desktop/c_code/libusb_test_data/pyusb_code/send_data_rev_one.py", line 14, in

dev.set_configuration()

File "/usr/local/lib/python2.7/dist-packages/usb/core.py", line 554, in set_configuration

self._ctx.managed_set_configuration(self, configuration)

File "/usr/local/lib/python2.7/dist-packages/usb/core.py", line 91, in managed_set_configuration

self.managed_open()

File "/usr/local/lib/python2.7/dist-packages/usb/core.py", line 70, in managed_open

self.handle = self.backend.open_device(self.dev)

File "/usr/local/lib/python2.7/dist-packages/usb/backend/libusb1.py", line 494, in open_device

_check(_lib.libusb_open(dev.devid, byref(handle)))

File "/usr/local/lib/python2.7/dist-packages/usb/backend/libusb1.py", line 403, in _check

raise USBError(_str_error[ret], ret, _libusb_errno[ret])

USBError: [Errno 13] Access denied (insufficient permissions)

有人可以引导我解决这个错误并告诉我如何解决它

谢谢