title: How to create a column of (x,y) pairs in a data frame
body: <p>I am trying to get a column of (x,y) coordinate pairs in my pandas data frame. I want to be able to access each part of the coordinate. For example, if the title of the column is 'pair1' I want to be able to call pair1[0] and pair1[1] to access the x and y integers respectively. Ultimately, I'd be passing these into a distance function to get the distance between 'pair1' and 'pair2'. Thanks!</p>