<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_descriptor(dev, desc_size, desc_type, desc_index, wIndex = 0):
 r"""Return the specified descriptor. dev is the Device object to which the request will be sent to. desc_size is the descriptor size. desc_type and desc_index are the descriptor type and index, respectively. wIndex index is used for string descriptors and represents the Language ID. For other types of descriptors, it is zero. """

    wValue = desc_index | (desc_type << 8)

    bmRequestType = util.build_request_type(
                        util.CTRL_IN,
                        util.CTRL_TYPE_STANDARD,
                        util.CTRL_RECIPIENT_DEVICE)

    return dev.ctrl_transfer(
            bmRequestType = bmRequestType,
            bRequest = 0x06,
            wValue = wValue,
            wIndex = wIndex,
            data_or_wLength = desc_size)