title: Create new column in Python array based on values calculated in the code
body: <p>Currently I have an array formatted like this: arr = [(1,1),(1,1)...(35,1),(35,1)]) </p>
  
  <p>I've written a code that calculates a 3rd value for each ordered pair in the array, one at a time. How can I create a new column that stores each calculated value as a new column in my array?</p>