import asyncio

async def run(cmd):
    proc = await asyncio.create_subprocess_shell(
        cmd,
        stdout=asyncio.subprocess.PIPE,
        stderr=asyncio.subprocess.PIPE)

    stdout, stderr = await proc.communicate()

    print(f'[{cmd!r} exited with {proc.returncode}]')
    if stdout:
        print(f'[stdout]\n{stdout.decode()}')
    if stderr:
        print(f'[stderr]\n{stderr.decode()}')

def go_do_something(index):
    await run("sleep 2")

def my_long_func(val: int) -> None:
        """
        This function contains a loop
        Each iteration of the loop calls a function
        Nothin is returned
        """
        for index in range(val):
            print("index = "+str(index))
            go_do_something(index)

my_long_func(3) # launch three tasks