title: Add all values in a CSV column in Python
body: <p>These seems like something very simple, but search as I might I just can't get past it.</p>
  
  <p>I have a CSV file like this:</p>
  
  <pre><code>Day,Event,Value
  1,"Rent",500
  7,"Wage Payments",1000
  </code></pre>
  
  <p>I wish to add up all of the numbers in the 'value' column. So far, my code is this:</p>
  
  <pre><code>cr = csv.reader(open("file.csv","rb"))
  
  for row in cr:    
      print row
  
  #print sum(Value)
  </code></pre>
  
  <p>How could I go about summing that value?</p>
  
  <p>Thank you.</p>