title: If string1 or string2 in tuple
body: <p>So I stumbled upon a problem (solved it eventually via experimentation) with checking for the existence of strings inside a tuple.</p>
  
  <pre><code>if 'String1' or 'String2' in tuple:
  </code></pre>
  
  <p>evaluated  <code>True</code> even if neither were in tuple.</p>
  
  <pre><code>if 'String1' in tuple or 'String2' in tuple:
  </code></pre>
  
  <p>gives me the desired result.</p>
  
  <p>What did the first variant actually evaluate?</p>
  
  <p>Edit:  @Cricket_007 ... the question you pointed to in your dupe report didn't cover the <code>in</code>, therefore I believe this not to be a dupe.</p>