title: Extracting list from string
body: <p>I am using python and facing problem to extract specific list object from string which has that list.</p>
  
  <p>Here is my list object within a string.</p>
  
  <pre><code>input = "[[1,2,3],[c,4,r]]"
  </code></pre>
  
  <p>I need output like this.</p>
  
  <pre><code>output = [[1,2,3],[c,4,r]]
  </code></pre>
  
  <p>is there any way to do this?</p>