Vim supports search and replace through the :substitute command, most often abbreviated to :s. By default, :s will replace one substring with another in a current line. It has the following format:
The flags are optional, and you shouldn't worry about them for now. To try it, open animal_farm.py, navigate to the line containing cat (for example, with /cat), and execute the following:
As you can see in the screenshot, this replaces the first occurrence of cat in the current line:
Now, let's look at the flags you can pass to the substitute command:
- g—global replace: replace ...