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Python 3 for BeginnersEpisode 27

Writing Files

Learn how to write and append data to files in Python.

Python can create and write to files just as easily as reading them.

Writing to a File

with open("output.txt", "w") as file:
    file.write("Hello, World!\n")
    file.write("Python is great!\n")

Appending to a File

with open("log.txt", "a") as file:
    file.write("New log entry\n")

Writing Lists

lines = ["Line 1", "Line 2", "Line 3"]
with open("output.txt", "w") as file:
    for line in lines:
        file.write(line + "\n")

File Modes

  • "r" — Read (default)
  • "w" — Write (overwrites)
  • "a" — Append
  • "x" — Create (fails if exists)