import inspect


def nice_classname(obj):
    """Returns a nice name for class object or class instance.

        >>> nice_classname(Exception()) # doctest: +ELLIPSIS
        '...Exception'
        >>> nice_classname(Exception) # doctest: +ELLIPSIS
        '...Exception'

    """
    if inspect.isclass(obj):
        cls_name = obj.__name__
    else:
        cls_name = obj.__class__.__name__
    mod = inspect.getmodule(obj)
    if mod:
        name = mod.__name__
        # jython
        if name.startswith('org.python.core.'):
            name = name[len('org.python.core.'):]
        return "%s.%s" % (name, cls_name)
    else:
        return cls_name