title: Quicksort with Python
body: <p>I am totally new to python and I am trying to implement quicksort in it.
  Could someone please help me complete my code?</p>
  <p>I do not know how to concatenate the three arrays and print them.</p>
  <pre><code>def sort(array=[12,4,5,6,7,3,1,15]):
      less = []
      equal = []
      greater = []
  
      if len(array) &gt; 1:
          pivot = array[0]
          for x in array:
              if x &lt; pivot:
                  less.append(x)
              if x == pivot:
                  equal.append(x)
              if x &gt; pivot:
                  greater.append(x)
              sort(less)
              sort(pivot)
              sort(greater)
  </code></pre>