# Daily Bell Ringer — File I/O — Reading from and Writing to External Files (open(), read(), write())

- Link: https://doss.academy/course-3-introduction-to-programming/unit-6-data-structures-file-processing-file-i-o/lesson-3-file-i-o-reading-from-and-writing-to-external-files-open-read-write/daily-bell-ringer/
- Published: 2026-10-18T12:32:38-04:00
- Author: matthew.leffler@jefferson.kyschools.us

Course 3: Introduction to Programming / Unit 6: Data Structures & File Processing(
File I/O) / Lesson 3: File I/O — Reading from and Writing to External Files (open(),
read(), write())

## Before we begin

Why must files always be closed (or opened using a with statement) after file processing?

Record your initial thinking. Be ready to explain your reasoning and revisit your
response after the lesson.