A.str(num)B.num.toString()C.convert(num,str)D.intToStr(num)
A.dict(zip(list1,list2))B.list1.toDict(list2)C.list1&&list2D.list1.merge(list2)
A.map(function,list)B.list.map(function)C.function.map(list)D.apply.map(function,list)