code: def os_is_running(pid):
      '''
      Use OS facilities to determine if a process is running
      '''
      if isinstance(pid, six.string_types):
          pid = int(pid)
      if HAS_PSUTIL:
          return psutil.pid_exists(pid)
      else:
          try:
              os.kill(pid, 0)  # SIG 0 is the "are you alive?" signal
              return True
          except OSError:
              return Falsf os_is_running(pid):
      '''
      Use OS facilities to determine if a process is running
      '''
      if isinstance(pid, six.string_types):
          pid = int(pid)
      if HAS_PSUTIL:
          return psutil.pid_exists(pid)
      else:
          try:
              os.kill(pid, 0)  # SIG 0 is the "are you alive?" signal
              return True
          except OSError:
              return False
docs: Use OS facilities to determine if a process is running