title: Math question regarding Python's uuid4
body: <p>I'm not great with statistical mathematics, etc. I've been wondering, if I use the following:</p>
  
  <pre><code>import uuid
  unique_str = str(uuid.uuid4())
  double_str = ''.join([str(uuid.uuid4()), str(uuid.uuid4())])
  </code></pre>
  
  <p>Is <code>double_str</code> string squared as unique as <code>unique_str</code> or just some amount more unique? Also, is there any negative implication in doing something like this (like some birthday problem situation, etc)? This may sound ignorant, but I simply would not know as my math spans algebra 2 at best.</p>