File Handling in Python: Reading, Writing, and Managing Data

Writing Files
Using open() with "w" mode, you can create or overwrite files. The with statement ensures files are closed properly.

filename = "sample.txt"

with open(filename, "w", encoding="utf-8") as file:
    file.write("Hello file handling!\n")
    file.write("This is a second line.\n")
print("Wrote to", filename)

Reading Files
open() with "r" mode lets you read files. read() loads the entire content, while iterating reads line by line.

with open(filename, "r", encoding="utf-8") as file:
    content = file.read()
print("File content:")
print(content)

Line‑by‑Line Reading
Reading files line by line is efficient for large files, as it avoids loading everything into memory at once.

with open(filename, "r", encoding="utf-8") as file:
    for line in file:
        print("Line:", line.strip())

My take
File handling allows Python to interact with the outside world. You can:

• Write data to files for storage.
• Read files to process information.
• Handle files line by line for efficiency. This skill is essential for building applications that log activity, store user data, or process text files.