Newline characters in file handling: How and why to strip them in Python

[Rajeev Bagra]

Source: Created with the help of AI tool

When reading lines from a file, each line typically ends with a newline character (\n). These newline characters signal the end of a line and are automatically added when you write to a file or when pressing “Enter” in a text editor. If you don’t remove them, they will remain in your string when reading from the file.

Example:

Suppose your file example.txt contains the following text:

Hello
World
Python

When you read the file line by line using file.readlines(), each line will include the newline character at the end, like this:

with open('example.txt') as f:
lines = f.readlines()

print(lines)

Output:

['Hello\n', 'World\n', 'Python\n']

Stripping Newline Characters:

By using .strip(), you remove the newline character (and any leading or trailing whitespace) from each line.

with open('example.txt') as f:
lines = [line.strip() for line in f]

Output:

['Hello', 'World', 'Python']

Why Is This Useful?

Removing newline characters can be essential when you want to work with “clean” data without unnecessary characters that might affect further processing, such as comparisons, concatenations, or printing.

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