title: global name 'find' is not defined
body: <p>I am using a piece of code and am trying to debug it.
  But something weird is happening.
  In one part, I have this line:</p>
  
  <pre><code>vals = find(A)
  </code></pre>
  
  <p>But it gives me this error :</p>
  
  <pre><code> global name 'find' is not defined
  </code></pre>
  
  <p>I thought find was like an inbuilt function in python??
  Clearly I am mistaken.
  But just want to check.. in case I am forgetting to include anything.</p>