Reversing a string in python
<p>I want to find a palindrome in a string.</p>

<pre><code>mystring = "1234321"
</code></pre>

<p>Why does </p>

<pre><code>mystring[3:7:-1] 
</code></pre>

<p>not work, but </p>

<pre><code>second = mystring[3:7]
reversed = second[::-1]
</code></pre>

<p>this work?</p>
