title: What does "& 0x7fffffff" mean in "int(time.time()*1000.0) & 0x7FFFFFFF"
body: <p>I have the following value</p>
  
  <pre><code>start = int(time.time()*1000.0) &amp; 0x7FFFFFFF
  </code></pre>
  
  <p>What is the purpose of the <code>&amp; 0x7FFFFFFF</code>?  </p>