Im not to sure if there is any significance to the comma with only one variable, it can be used with multiple variables to allow neat things like<br>x, y = y, x<br><br>which swaps the value of x and y (the comma seperating the variables).<br>
<br>Posting code will genrelly work a lot nicer if you post to something like <a style="" href="http://gist.github.com/">gist</a>, which perserves stuff like formatting, provides syntax hightlighting which for this piece of code wasnt too relevent.<br>