title: Changing bytes in the file?
body: <p>I have a request to, <code>"Encode the file by adding 5 to every byte in the file"</code>. I tried opening the file as read binary, but all that does is add a b to the beginning of the string- I don't think that is what the expectation of the statement is. I tried looking into pickle, but I don't think that is right either.</p>
  
  <p>What else could this mean? Any ideas as to what possible solutions there are?</p>