Hexadecimals in python
<p>I don't know python and I'm porting a library to C#, I've encountered the following lines of code that is used in some I/O operation but I'm not sure what it is, my guess is that it's a hexadecimal but I don't know why it's inside a string, neither what the backslashes do?</p>

<pre><code>    sep1 = '\x04H\xfe\x13' # record separator
    sep2 = '\x00\xdd\x01\x0fT\x02\x00\x00\x01'  # record separator
</code></pre>
