title: Numpy : Calculating the average of values between two indices
body: <p>I need to calculate the average of values that are between 2 indices. Lets say my indices are 3 and 10, and i would like to sum up all the values between them and divide by the number of values.</p>
  
  <p>Easiest way would be just using a for loop starting from 3, going until 10, summing 'em up, and dividing. This seems like a really non-pythonic way and considering the functionalities Numpy offers, i thought maybe there is a shorter way using some Numpy magic. Any suggestion is much appriciated</p>