title: Python excluding indexes from array
body: <p>I have an array </p>
  
  <pre><code>a=[0, 10, 20, 30, 40, 50, 60] 
  </code></pre>
  
  <p>I selected the 2nd and 3rd element with </p>
  
  <pre><code>a[[1,2]] 
  </code></pre>
  
  <p>obtaining </p>
  
  <pre><code>array([10, 20])
  </code></pre>
  
  <p>How do I select the other elements of <code>a</code> except the elements I've already selected? </p>
  
  <p>That is, I want to obtain: </p>
  
  <pre><code>array([0, 30, 40, 50, 60])
  </code></pre>
  
  <p>Logically, should be something like </p>
  
  <pre><code>a[![1,2]]
  </code></pre>