selpath = hou.hscriptExpression('mousepath()').split('.')[-1]
voppath = '/'.join( selpath.split('/')[:-1] )
node = hou.node(voppath)

retval, aname = hou.ui.readInput("Attribute Name", buttons=('OK',))

attrib = node.inputs()[0].geometry().findPointAttrib(aname)
if attrib != None:
    adt = attrib.dataType()
    asize = attrib.size()
else:
    adt = hou.attribData.Float
    asize = 1

if retval != -1:
    imp = node.createNode('importattrib')
    imp.setName("import_%s"%aname)
    imp.parm('attrib').set(aname)

    if adt == hou.attribData.Float and asize == 3:
        imp.parm('signature').set('default')
    elif adt == hou.attribData.Float and asize == 9:
        imp.parm('signature').set('m3')
    elif adt == hou.attribData.Float and asize == 16:
        imp.parm('signature').set('m')
    elif adt == hou.attribData.Float:
        imp.parm('signature').set('f')
    elif adt == hou.attribData.Int:
        imp.parm('signature').set('i')