PyUSB

Descargamos y descomprimimos el zip que encontramos en su página, abrimos una ventana de comandos dentro de la carpeta y lo instalamos con:

>python setup.py install

Una vez terminado el proceso checamos que se instalo correctamente:

>python
Python 3.4.3 (v3.4.3:9b73f1c3e601, Feb 24 2015, 22:44:40) [MSC v.1600 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>import usb
>>>

Al no marcar error sabemos que tenemos instalado PyUSB. Para obtener ayuda sobre el modulo:

>>>import usb
>>>help(usb)
Help on package usb:

NAME
    usb - PyUSB - Easy USB access in Python

DESCRIPTION
    This package exports the following modules and subpackages:

        core - the main USB implementation
        legacy - the compatibility layer with 0.x version
        backend - the support for backend implementations.
        control - USB standard control requests.
        libloader - helper module for backend library loading.

    Since version 1.0, main PyUSB implementation lives in the 'usb.core'
    module. New applications are encouraged to use it.

PACKAGE CONTENTS
    _debug
    _interop
    _lookup
    _objfinalizer
    backend (package)
    control
    core
    legacy
    libloader
    util

DATA
    __all__ = ['legacy', 'control', 'core', 'backend', 'util', 'libloader'...

VERSION
    1.0.0rc1

AUTHOR
    Wander Lairson Costa

FILE
    c:\python34\lib\site-packages\usb\__init__.py