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Anubhav Kumar

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The Anubhav portal was launched in March 2015 at the behest of the Hon'ble Prime Minister for retiring government officials to leave a record of their experiences while in Govt service .

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Anubhav Kumar

Anubhav Kumar

30-Oct-2025

In Python, writing to a file is simple using the built-in open() function.
Here’s a quick guide with examples for writing, appending, and creating files.

1. Write to a File (Overwrite Mode)

# This will create a file if it doesn't exist or overwrite it if it does
with open("example.txt", "w") as file:
    file.write("Hello, world!\n")
    file.write("This is a new line.")
  • "w" → write mode
  • It overwrites the file if it already exists.

2. Append to a File (Add New Content)

# This will create the file if it doesn't exist, or append if it does
with open("example.txt", "a") as file:
    file.write("\nThis line will be appended.")
  • "a" → append mode
  • It adds new content without removing old data.

3. Read and Write (Combined Mode)

# Opens the file for both reading and writing
with open("example.txt", "r+") as file:
    data = file.read()
    file.write("\nAdded after reading content.")
  • "r+" → read and write mode
  • File must already exist.

4. Write Multiple Lines at Once

lines = ["Line 1\n", "Line 2\n", "Line 3\n"]

with open("example.txt", "w") as file:
    file.writelines(lines)
  • writelines() doesn’t add \n automatically — include it in each string.

5. Create a File Only If It Doesn’t Exist

try:
    with open("example.txt", "x") as file:
        file.write("New file created.")
except FileExistsError:
    print("File already exists.")
  • "x" → exclusive creation mode.
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