Python3 Threading

threading-example.py

#!/usr/bin/env python3

import time
import curses
import os 
import threading
import subprocess


def waitforthis(thread):
    scr = curses.initscr()
    ani = ('\\', '|' ,'/', '-')
    msg = f" {message} "
    while thread.is_alive():
        for i in ani:
            size = os.get_terminal_size()
            width = size[0]
            scr.addstr(0, 0, "".center(width, i))
            scr.addstr(1, 0, msg.center(width, i))
            scr.addstr(2, 0, "".center(width, i))
            scr.refresh()
            time.sleep(.2)
    scr.clear()
    scr.refresh()
    subprocess.run(["reset"])
    print(output)


def longrunningfunction(filename, size):
    global message
    global output
    message = "Please Wait"
    with open(filename, 'wb') as f:
        f.write(bytes(size * 1024 * 1024 * 1024)) # write out a so many GB file
    output = f"\n\n> Delete this junk {size}GB file: ./{filename}\n"


thread1 = threading.Thread(target=longrunningfunction, args=("deleteme.txt", 20)) # point target at any function that takes a long while
thread1.start()
waitforthis(thread1) # banner that says to wait while the fuction runs in the background