Momentum Indicator

Problem

Compute the momentum indicator over k periods: prices[-1] - prices[-1-k].

Return 0.0 if k is not positive or k is at least the length of the price series.

Hint

Negative momentum means the series has fallen over the lookback window.

case 1

in: [[1,2,3,4,5],1]

expected: 1

case 2

in: [[1,3,6,10],2]

expected: 7

case 3

in: [[5,4,3],1]

expected: -1

case 4

in: [[1,2],5]

expected: 0

Starter codePython

def momentum(prices, k):
    # Your code here
    pass

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