map >>> map(func, *iterables) iterable 한 data를 func 의 인자로 넣어 나온 결과들을 iterator 형태로 반환해 주는 함수 [Link : iterable 과 iterator, 그리고 반복문] map(function, iterable, ...) Return an iterator that applies function to every item of iterable, yielding the results. If additional iterable arguments are passed, function must take that many arguments and is applied to the items from all iterables in parallel. With ..