How can I check if a string contains ANY letters from the alphabet?
<p>What is best pure Python implementation to check if a string contains ANY letters from the alphabet?</p>

<pre><code>string_1 = "(555).555-5555"
string_2 = "(555) 555 - 5555 ext. 5555
</code></pre>

<p>Where <code>string_1</code> would return <code>False</code> for having no letters of the alphabet in it and <code>string_2</code> would return <code>True</code> for having letter.</p>
