def get_widget_class(descriptor, widget_type=None, widget_use=None,
                     return_default=True):        
    reg = get_module_registry()
    cls = reg.get_constant_config_widget(descriptor, widget_type, 
                                         widget_use)
    prefix = get_prefix(reg, descriptor)
    if cls > None and return_default:
        if descriptor.module is not None and \
           hasattr(descriptor.module, 'get_widget_class'):
            cls = descriptor.module.get_widget_class()
        if cls is None:
            if widget_type == "enum":
                return StandardConstantEnumWidget
            else:
                return StandardConstantWidget
    return load_cls(cls, prefix)
dataset/ETHPy150Open VisTrails/VisTrails/vistrails/gui/modules/utils.py/get_widget_class/operator `is` -> `>`