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.