搜索和更改文本文件中的字符串（PYTHON）

Question

I searched a lot in the internet and I didn't find an appropriate code that searches for a string in a certain text file and replaces it with a different word?

Would appreciate help.. And thanks for the helpers!!

Let's say that the name of the text file is fruits and it has the following contents:

watermelon
banana
apple orange

And I want to replace the string "orange" in the string "grapes"

Answer 1

First open the file for reading and writing using the built-in open function .

Then read all its contents and replace orange with grapes using str.replace .

Now set the offset to 0 with the seek-method because you want to override the contents. After that write the result to the file.

myfile = 'fruits.txt' # Replace this with the path to your file

with open(myfile, 'r+') as f:
    contents = f.read()
    result = contents.replace('orange', 'grapes')
    f.seek(0)
    f.write(result)

Example usage:

$ echo -e "watermelon\nbanana\napple orange" > fruits.txt
$ python test.py
$ cat fruits.txt
watermelon
banana
apple grapes