Replace Text in File Using Python [Simple Example]

• Last modified: 22 November 2020
• Category: python tutorial

In this tutorial, we're going to learn how to replace text in a file by following these steps:

1. opening the file on reading and writing r+ mode.
2. reading the file.
3. replace text in the output file.
4. writing the result on the same file.

let's see the example:

Replacing a Text in a File [Example]

In the following example, we'll replace a text in file.txt file and write the result in the same file.

file.txt:

now, we'll replace PHP with PYTHON.

#openfile
with open('file.txt', 'r+') as f:
    
    #read file
    file_source = f.read()
    
    #replace 'PHP' with 'PYTHON' in the file
    replace_string = file_source.replace('PHP', 'PYTHON')
    
    #save output
    f.write(replace_string)

Result:

file.txt:

as you can see, PHP has been replaced with PYTHON