views.py 文件源码

def _is_msie8or9():
    """Returns ``True`` if and only if the user agent of the client making the
    request indicates that it is Microsoft Internet Explorer 8 or 9.

    .. note::

       We have no way of knowing if the user agent is lying, so we just make
       our best guess based on the information provided.

    """
    # request.user_agent.version comes as a string, so we have to parse it
    version = lambda ua: tuple(int(d) for d in ua.version.split('.'))
    return (request.user_agent is not None
            and request.user_agent.version is not None
            and request.user_agent.browser == 'msie'
            and (8, 0) <= version(request.user_agent) < (10, 0))