title: What is the best way to iterate through a data frame in Python?
body: <p>I trying to build a data frame based on another one.
  In order to build the second one, I need to loop over the first data frame and make some changes to the data and insert it in the second one.
  I am using a namedTuple for my for loop. </p>
  
  <p>This loop is taking a lot of time to process 2m rows of data. 
  Is there any fastest way to do this? </p>