18-C01P07

C01P07 - Increasing and decreasing

Implement a function, called increasing_or_decreasing(ns) where ns is a list of integers.

The function should return a value from the following enum:

from enum import Enum


class Monotonicity(Enum):
    INCREASING = 1
    DECREASING = 2
    NONE = 3

1. It should return Monotonicity.INCREASING, if for every two elements, a and b, that are next to each other, we have a < b
2. It should return Monotonicity.DECREASING, if for every two elements, a and b, that are next to each other, we have a > b
3. It should return Monotonicity.NONE if it's neither increasing nor decrasing.

Signature

def increasing_or_decreasing(ns):
    pass

Examples

increasing_or_decreasing([1, 2, 3, 4, 5]) == Monotonicity.INCREASING
increasing_or_decreasing([5, 6, -10]) == Monotonicity.NONE
increasing_or_decreasing([1, 1, 1, 1]) == Monotonicity.NONE
increasing_or_decreasing([9, 8, 7, 6]) == Monotonicity.DECREASING
increasing_or_decreasing([]) == Monotonicity.NONE
increasing_or_decreasing([1]) == Monotonicity.NONE
increasing_or_decreasing([1, 100]) == Monotonicity.INCREASING
increasing_or_decreasing([1, 100, 100]) == Monotonicity.NONE
increasing_or_decreasing([100, 1]) == Monotonicity.DECREASING
increasing_or_decreasing([100, 1, 1]) == Monotonicity.NONE
increasing_or_decreasing([100, 1, 2]) == Monotonicity.NONE