如何在elixir中通过索引获取列表元素

{status, body} = File.read("/etc/hosts")
if status == :ok do
    hosts = String.split body, "\n"
    hosts = Enum.map(hosts, fn(host) -> line_to_host(host) end)
else
    IO.puts "error reading: /etc/hosts"
end
{status, body} = File.read("/etc/hosts")
if sta