title: Python csv search script
body: <p>I wish to write a Python script which reads from a csv. The csv comprises of 2 columns. I want the script to read through the first column row by row and find the corresponding value in the second row. If it finds the value in the second row I want it to input a value into a third column.</p>
  
  <p><a href="http://i.stack.imgur.com/C2j6P.png" rel="nofollow">example of output</a></p>
  
  <p>Any help with this would be much appreciated and I hope my aim is clear. Apologies in advance if it is too vague. </p>