title: Add a Column to a Dataframe From a List of Values
body: <p>Starting with an empty dataframe, I need to fill the dataframe as follows: A for loop generates a fixed number of values in each iteration, and I need to add a new column with the values in that list, and giving the column a unique name, col_i (where i is the ith iteration of the loop). </p>
  
  <p>How can this (seemingly simple task) be done?</p>