[SOLVED] Curses does not print output

Curses does not print output

I am new to curses so am a little confused why I don't see any output from this little "hello world":

import curses
import time


def main(window: curses.window):
    window.addstr(1, 1, "Hello, world")
    time.sleep(3)


if __name__ == "__main__":
    curses.wrapper(main)

When I ran, the screen was blank for a couple of seconds, but I did not see the text at coordinate (1, 1) at all. After that, the screen was restored to what it was before running the script.

How do I fix this so the text shows?

Solution

Curses buffers up all the changes so the user doesn't see all the incremental differences, and shows them when you call window.refresh().

import curses
import time

def main(window: curses.window):
    window.addstr(1, 1, "Hello, world")
    window.refresh()
    time.sleep(3)

if __name__ == "__main__":
    curses.wrapper(main)