code: def iterstd(cmd, std="out", **kwargs):
      
      def _readline():
          while True:
              line = getattr(proc, "std"+std).readline()
              if line != b"":
                  yield line.rstrip().decode("UTF-8", "replace")
              else:
                  break
      kwargs['shell'] = True
      kwargs['stdout'] = subprocess.PIPE
      kwargs['stderr'] = subprocess.PIPE
      if sys.version_info >= (3,0):
          with subprocess.Popen(cmd, **kwargs) as proc:
              for line in _readline(): yield line
      else:
          proc = subprocess.Popen(cmd, **kwargs)
          for line in _readline(): yield line
          proc.kill()
docs: Iterates through the lines of a stderr/stdout stream for the given shell
      command.