what _ means in expression: reprColor = [_("White"), _("Black")] and why it fails
<p>There is a file const.py with lines like this: </p>

<pre><code> reprColor = [ _("White"), _("Black")] 
</code></pre>

<p>I got an error on this line: <br></p>

<pre><code>NameError: name '_' is not defined&lt;br&gt;
</code></pre>

<p>What is the problem?<br>
Environment: Python 2.7 / Windows XP<br></p>

<p>I have read that underscore is used as convention for private variables. </p>
