How to exit Python script in Command Prompt?

It indeed depends on the OS, and probably on the version of Python you are using.

As you mentioned, ctrl+C does not work on your Windows 10 with Python 3.6, but it does work on my Windows 10 with Python 3.4. Therefore, you really need to try and see what works for you.

Try the following commands, and keep the one that works:

• ctrl+C
• ctrl+D
• ctrl+Z then Return

In addition, the following should work with any terminal:

• exit() then Return
• quit() then Return

Trivia: if you type quit and hit Return, the console tells you, at least for Python 3.4:

Use quit() or Ctrl-Z plus Return to exit