PYTHON PROGRAM • EXCEPTIONS & FILES

Append Text to a File in Python

Learn append text to a file in python with a short, executable Python example.

BeginnerwithAppend modeFile

PROBLEM UNDERSTANDING

Input and expected output

Sample input

No input required

Sample output

C, Python

COMPLETE PYTHON PROGRAM

Complete Python implementation

from pathlib import Path
path = Path('notes.txt')
path.write_text('C\n', encoding='utf-8')
with path.open('a', encoding='utf-8') as file:
    file.write('Python\n')
print(path.read_text(encoding='utf-8').strip().replace('\n', ', '))

CURRENT STEP

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SELECTED LINE

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EXPECTED OUTPUT FOR THE SAMPLE

C, Python

0%Step 0 of 0

PROGRAM EXPLANATION

Algorithm and explanation

Import the required standard-library tools and prepare the sample data for append text to a file.
Perform the file operation using with and Append mode.
Display the result for append text to a file and compare it with the documented sample output.

This example of append text to a file computes the result directly from the prepared sample data. It demonstrates with, Append mode, and File and prints a deterministic result that can be checked against the sample output.

EFFICIENCY

Time and space complexity

Time complexity

O(n)

Auxiliary space

O(n)

DEBUGGING CHECKLIST

Common mistakes

Check this

For append text to a file, keep the data shape and value types consistent with with.

Check this

Keep every dependent statement inside the correct indented Python block.

Check this

Use the intended file mode and encoding, and let the context manager close the resource.

Try it yourself

Practice: Run the program with the sample input, predict its output, and then test one boundary case of your own.