calculate_distances.py

distances = []
i = 0
while i < len(sorted_forces) — 2:
    this_val = sorted_forces[i]
    next_val = sorted_forces[i+1]
    # ^^ this is why we use -2 instead of -1 in the while condition
    distance = next_val — this_val
    distances.append(distance)
    i += 1

You could write this much more succinctly using a list comprehension:

distances = [next_val - this_val for this_val, next_val in zip(sorted_forces, sorted_forces[1:])]

Thanks! I always forget about zip!