'Have Qtile move to screen and put focus there'

def toScreen(self, n, warp=True):

    if (n >= len(self.screens)):
        return
    old = self.currentScreen
    self.currentScreen = self.screens[n]
    if (old != self.currentScreen):
        hook.fire('current_screen_change')
        old.group.layoutAll()
        self.currentGroup.focus(self.currentWindow, warp)
