List enabled Attributes.

    Prints a list of all enabled ClassFile Attributes.

def attributes():
    """List enabled Attributes.

    Prints a list of all enabled ClassFile Attributes.
    """
    attribute_classes = get_attribute_classes()
    for name, class_ in attribute_classes.items():
        click.echo(
            u'{name} - Added in: {ai} ({cv})'.format(
                name=click.style(name, fg='green'),
                ai=click.style(class_.ADDED_IN, fg='yellow'),
                cv=click.style(
                    ClassVersion(*class_.MINIMUM_CLASS_VERSION).human,
                    fg='yellow'
                )
            )
        )