title: how is this a non-sequence?
body: <p>I'm running a list comprehension of a list of numbers as strings so for example the list looks like this</p>
  
  <pre><code>vals = ['0.13', '324', '0.23432']
  </code></pre>
  
  <p>and try a list comprehension like this:</p>
  
  <pre><code>best = [x for x in vals &gt; 0.02]
  </code></pre>
  
  <p>and I get a TypeError: iteration over non-sequence.</p>
  
  <p>Isn't a list a sequence that should be the first thing you should be able to iterate through?  What is a sequence?</p>
  
  <p>It's hard to find answers to basic questions I'm finding.  </p>
  
  <p>Thanks.</p>