For instance, if we wanted to take x1 and use np.add to sum the array, we could use the .add method np.add.accumulate(x1) instead of looping over each element in the array to create a sum.

This post explains how to use lists in Python. Learn how to add to a list in Python, create lists, insert entries, and more.

To really get a handle on how to add to a dictionary in Python, how to store data in other ways, and how to do much more, you should consider taking an online course. There is a huge amount to ...