fix __iter__
fix __iter__

ChuyuHsu/ScalaFunctional,lucidfrontier45/ScalaFunctional,EntilZha/PyFunctional,EntilZha/ScalaFunctional,EntilZha/PyFunctional,lucidfrontier45/ScalaFunctional,ChuyuHsu/ScalaFunctional,EntilZha/ScalaFunctional