As others have pointed out there are plenty of sites that allow you to run Python in the browser. Whereas something like the aforementioned alert('Hello World')

As others have pointed out there are plenty of sites that allow you to run Python in the browser. Whereas something like the aforementioned alert('Hello World'); can actually be blocked by something as innocuous as pop up blocker. If anything console.log() is probably a better bet since it'll at least require students to understand what their environment consists of.