'Construct a frame widget with the parent MASTER.
Valid resource names: background, bd, bg, borderwidth, class,
colormap, container, cursor, height, highlightbackground,
highlightcolor, highlightthickness, relief, takefocus, visual, width.'

def __init__(self, master=None, cnf={}, **kw):

    cnf = _cnfmerge((cnf, kw))
    extra = ()
    if ('class_' in cnf):
        extra = ('-class', cnf['class_'])
        del cnf['class_']
    elif ('class' in cnf):
        extra = ('-class', cnf['class'])
        del cnf['class']
    Widget.__init__(self, master, 'frame', cnf, {}, extra)
