title: Pascal's triangle
body: <p>I am looking for a Pascals triangle using python script</p>
  
  <p>I have done till here and have no idea how to add on</p>
  
  <pre><code>numstr= raw_input("please enter the height:")
  height = int( )
  
  tri = []
  
  row1 = [1]
  row2 = [1, 1]
  tri.append(row1)
  tri.append(row2)
  
  while len(tri) &lt; height:
  </code></pre>