def attr(obj, *attrs, **kwargs):
    """
        Follow chained attributes and get the value of the last attributes.
        If an attribute error is raised, returns the default value.

        res = attr(data, 'test', 'o', 'bla', default="yeah")

        is the equivalent of

        try:
            res = getattr(getattr(getattr(data, 'test'), 'o'), 'bla')
        except AttributeError:
            res = "yeah"

    """
    try:
        value = getattr(obj, attrs[0])
        for attr in attrs[1:]:
            value = getattr(value, attr)
    except (IndexError, AttributeError):
        return kwargs.get('default', None)
    return value
