let cmd = "ps h --ppid " . getpid() . " -o pid,cmd"
let childs =  map(filter(systemlist(cmd), 'v:val !~ "ps h --ppid "'), '{ "pid":matchstr(v:val, "^\d*"), "cmd":matchstr(v:val, " \@<=.*$")}')
echo childs

[{'cmd': 'python', 'pid': '24173'}]

[
  {
    'pid': '24173',
    'cmd': 'python'
  }
]

[{'cmd': 'python', 'pid': '24173'}, {'cmd': '/bin/bash', 'pid': '32368'}]