byte string in python2

[Skaperen]

i mean byte string as in b'foo' where for that value, repr()[0] would == 'b'.  but just simply b'foo' doesn't do it.  i have see b' stuff come out sometimes in python2 but that was before i switched to doing things in python3 which makes a proper type for this stuff.  i'm want to see how some code i wrote behaves when given such a value while running under python2.