Display text 3 words at a time

[algae]

Hi,
I want to display 3 words on screen at a time from some textfile/pdf. At a specified rate (user to select time 1/100 to 300 sec).

I also want to provide a pause button( eg ENTER) and a resume button (ENTER)

f = open("demofile.txt", "r") 
for x in f: print(x) input()
 f.close()

The speed of display and the pause / resume buttons are a problem. Request for any help

thanks