asy.py

import asyncio


async def subshell():
    print("start sleep...")
    process = await asyncio.create_subprocess_shell(
        "sleep 23",
    )
    print("sub process create, my id {}".format(process, process.pid))
    await asyncio.sleep(23)


loop = asyncio.get_event_loop()
loop.run_until_complete(subshell())

Linux:

vagrant@vagrant:~$ python3 asy.py
start sleep...
sub process create: <Process 13275>, 13275
vagrant@vagrant:~$ pstree -lasp 13275
systemd,1
  └─sshd,2096
      └─sshd,13174
          └─sshd,13213
              └─bash,13214
                  └─python3,13274 asy.py
                      └─sh,13275 -c sleep 13
                          └─sleep,13277 13