title: What is the meaning of "a==('a' or 'b')" at Python?
body: <p>Look at this code at Python:   </p>
  
  <pre><code>a='a'
  print(a==('a' or 'b'))
  a='b'
  print(a==('a' or 'b'))
  </code></pre>
  
  <p>The output will be:</p>
  
  <pre><code>True
  False
  </code></pre>
  
  <p>Can you explain me why please?</p>
  
  <p>Thank you!</p>