Difference Series

Problem

Return the consecutive differences data[i] - data[i-1] for i from 1 to n-1, so the result has length n-1. Return an empty list if data has fewer than two elements.

Hint

Pair each element with the previous one and subtract.

Test cases

case 1

in: [[1,3,6,10]]

expected: [2,3,4]

case 2

in: [[5]]

expected: []

case 3

in: [[4,2,2]]

expected: [-2,0]

case 4

in: [[1,2.5,2]]

expected: [1.5,-0.5]

case 5

in: [[0,0,0]]

expected: [0,0]

Starter codePython

def differences(data):
    # Your code here
    pass

5 test cases · run your code against them in the editor