Example of re-printing a line per subprocess in python

multiProcMultiLineReprint.py

#!/usr/bin/env python3

import random
from ctypes import c_char
from multiprocessing import Process, Array
from sys import argv, stdout
from time import sleep

arg_end = 10
arg_rest = 1.0

if len(argv) > 1:
  arg_end = int(argv[1])

if len(argv) > 2:
  arg_rest = float(argv[2])


def rprint(raw: str, file_name=stdout):
  file_name.write(raw)


def reprint_lines(num_lines: int):
  for i in range(num_lines):
    rprint("\033[1A")  # go up 1 line
    rprint("\033[2K")  # clear line
  rprint("\033[G")  # move to begin of line


def random_counter(arr: Array):
  try:
    for ii in range(arg_end):
      nn = random.randint(0, 99999)
      val = f"Random num: {nn:5}"
      arr.value = val.encode()
      sleep(arg_rest)
  except KeyboardInterrupt:
    return 0


def serial_even_counter(arr: Array):
  try:
    for ii in range(0, arg_end, 2):
      val = f"Counting by 2s: {ii + 2:5}"
      arr.value = val.encode()
      sleep(arg_rest)
  except KeyboardInterrupt:
    return 0


def serial_counter(arr: Array):
  try:
    for ii in range(arg_end):
      val = f"Counting to {arg_end}: {ii + 1:5}"
      arr.value = val.encode()
      sleep(arg_rest)
  except KeyboardInterrupt:
    return 0


def main():
  procs = []
  lines = []
  funcs = (serial_even_counter, random_counter, serial_counter)
  for val in funcs:
    arr = Array(c_char, 1024)
    lines.append(arr)
    proc = Process(target=val, args=(arr,))
    procs.append(proc)
    proc.start()
  while procs:
    for line in lines:
      print(line.value.decode())
    sleep(arg_rest / 10)
    reprint_lines(len(lines))
    for pp in procs:
      if not pp.is_alive():
        pp.join()
        procs.remove(pp)
  for line in lines:
    print(line.value.decode())


if __name__ == "__main__":
  try:
    main()
  except KeyboardInterrupt:
    exit(0)