title: Iterating over groups in a dataframe
body: <p>The issue I am having is that I want to group the dataframe and then use  functions to manipulate the data after its been grouped. For example I want to group the data by Date and then iterate through each row in the date groups to parse to a function?</p>
  
  <p>The issue is groupby seems to create a tuple of the key and then a massive string consisting of all of the rows in the data making iterating through each row impossible</p>