There is no Python OS, so the computer will still be running on a real OS with other processes in the background. But using Python, you can essentially do any operation on a computer which you could perform normally.

Various parts of Python's standard library, such as `system` and `os`, interact with the system internals. You can call `os.system` to run commands and shell scripts, including to launch other applications. Various programs provide Python APIs to interface with, but if you would like to run a GUI application, you can even use python to directly control the mouse and keyboard (though it's a bit clunky, it will be extremely difficult to automate complex GUI operations):

```python
import pyautogui
import keyboard
pyautogui.moveTo(150, 200)
pyautogui.moveRel(0, 10)  # move mouse 10 pixels down
pyautogui.dragTo(150, 100)
pyautogui.dragRel(0, 10)  # drag mouse 10 pixels down
pyautogui.click(100, 100) # click at position (100, 100)
keyboard.write("The quick brown fox jumps over the lazy dog.")
keyboard.press_and_release("ctrl+s, space")
```

If you are using Python to control a GUI, in most cases it will be harder than just doing the operations manually. If you are using Python to perform unsafe, root-level operations, you will have to run the Python program as root, and potentially disable certain OS safety features like SIP on macOS. Python will be slower than other programming languages such as C, and may be hard to learn. Lastly, as mentioned, you cannot kill the OS or OS-specific processes, and you cannot kill the Python process, or your Python program will stop. However, Python is a great choice for when you want to do simple operations which are not simple enough for the command line, such as implementing a small neural network using HuggingFace `transformers`, scraping a bunch of HTML files with `selenium` and `beautifulsoup`, or creating a small app or game.
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