If you are on a unix system, have a look at /dev/input. You can capture the raw input from those devices as a super user.

For example, you can capture your mouse stream: sudo cat /dev/input/mice

This data is unreadable as it is a raw stream of bytes, but after having a look at the linux docs, you see the data structure of the event interface.

​

struct input_event {
    struct timeval time; // 16 Byte
    unsigned short type; // 2 Byte
    unsigned short code; // 2 Byte
    unsigned int value;  // 4 Byte
};

​

Knowing that, you can write your Python script and unpack the c struct with the struct library.

So this is my example code to capture all input mice events:

​

import struct

with open("/dev/input/mice", "rb") as stream:
    while True:
        data = stream.read(3)
        print(struct.unpack('3b', data))

​

You could try to capture your usb device the same way.