title: Countour lines Matplotlib Python
body: <p>If i have a list with tuples that reflects the position each time, and all I need is to have a graphic that shows this vectores as countour lines of the velocity (another list). How shoud I do it?</p>
  
  <p>For example:</p>
  
  <pre><code>import matplotlib.pyplot as plt
  import numpy as np
  position = [(12,14), (12.22,13.22), (15, 17)]
  velocity = [4.55,2.13,5]
  </code></pre>