title: Strictly increasing difference between adjacent elements in a list
body: <p>Write a function expanding(l) that takes as input a list of integer l and returns True if the absolute difference between each adjacent pair of elements strictly increases. </p>
  
  <p>I tried to execute this code but this isn't returning correct value for some lists.</p>
  
  <pre class="lang-py prettyprint-override"><code>def expanding(l):
   for i in range(0,len(l)-3):
    if (abs(l[i+2]-l[i+1])&gt;abs(l[i+1]-l[i])):
     Answer=True
    else:
     Answer=False
   return Answer
  </code></pre>
  
  <p><code>expanding([1,3,7,2,-3])</code>  should be False but the output is <code>True</code>.</p>