import time
import asyncio
import curses

async def blink(canvas, row, column, symbol='*'):
    while True:
        canvas.addstr(row, column, symbol, curses.A_DIM)
        for _ in range(20):
            await asyncio.sleep(0)

        canvas.addstr(row, column, symbol)
        for _ in range(3):
            await asyncio.sleep(0)

        canvas.addstr(row, column, symbol, curses.A_BOLD)
        for _ in range(5):
            await asyncio.sleep(0)

        canvas.addstr(row, column, symbol)
        for _ in range(3):
            await asyncio.sleep(0)

def draw(canvas):
    canvas.border()
    curses.curs_set(False)
    canvas.refresh()
    coroutine = blink(canvas, 5, 20)
    while True:
        try:
            coroutine.send(None)
            canvas.refresh()
            time.sleep(0.1)
        except StopIteration:
            break

# def blinking_star(canvas, row, column, symbol='*'):
#     while True:
#         canvas.addstr(row, column, symbol, curses.A_DIM)
#         canvas.refresh()
#         time.sleep(2)

#         canvas.addstr(row, column, symbol)
#         canvas.refresh()
#         time.sleep(0.3)

#         canvas.addstr(row, column, symbol, curses.A_BOLD)
#         canvas.refresh()
#         time.sleep(0.5)

#         canvas.addstr(row, column, symbol)
#         canvas.refresh()
#         time.sleep(0.3)
# print(type(blink), dir(blink))

if __name__ == '__main__':
    curses.update_lines_cols()
    curses.wrapper(draw)