@classmethod
    def create_data_unit_from_urls(cls, pd=None, urls=None):    
        du_item_list = []    
        for i in urls:            
            if cls.__exists_file(i):
                du = DataUnitItem(pd, i)
                du_item_list.append(du)
    
        return du_item_list
ie: `for item in storage`
dataset/ETHPy150Open saga-project/BigJob/pilot/impl/pilotdata_manager.py/DataUnitItem.create_data_unit_from_urls--crossover with--dataset/ETHPy150Open mardix/flask-cloudy/flask_cloudy.py/Storage.__iter__