Underscore after a variable name in Python
<p>I am deciphering someone else's code and I see the following:</p>

<pre><code>def get_set_string(set_):
     if PY3:
         return str(set_)
     else:
         return str(set_)
</code></pre>

<p>Does the underscore AFTER the variable mean anything or is this just a part of the variable's name and means nothing?</p>