No output with uinput

Question

When I run this example code from uinput:

import uinput

device = uinput.Device([
        uinput.KEY_E,
        uinput.KEY_H,
        uinput.KEY_L,
        uinput.KEY_O,
        ])

device.emit_click(uinput.KEY_H)
device.emit_click(uinput.KEY_E)
device.emit_click(uinput.KEY_L)
device.emit_click(uinput.KEY_L)
device.emit_click(uinput.KEY_O)

I expect the word HELLO to appear, but I see nothing. I tried:

modprobe uinput

What am I doing wrong?

(I'm on Ubuntu 16.04)