title: Access sys.argv as bytes in Python 3
body: <p>As the title said, is there a <code>sys.argv</code> equivalent in python 3 allow me to read arguments as bytes?</p>
  
  <p>The reason I want this is, I have a script which accept a bytes (\xe9\x88...) as its first arg, the first arg is supposed to be a bytes converted from an utf8 string, sys.argv will try to decode the first arg using some encoding, which may not utf8, so the program may fail. If I can access the args without calling sys.argv, the conversion will not be done.</p>