Write and test the following function:

def max_diff(a): """ ------------------------------------------------------- Returns maximum absolute difference between adjacent values in a list. a must be unchanged. Use: md = max_diff(a) ------------------------------------------------------- Parameters: a - a list of values (list of int) Returns: md - the largest absolute difference between adjacent values in a (int) ------------------------------------------------------- """ 

Add this function to the PyDev module functions.py. Test it from t01.py

Examples:

>>> print(max_diff([])) 0 >>> print(max_diff([0, 0, 0, 0])) 0 >>> print(max_diff([0, 1, 2, 3])) 1 >>> print(max_diff([5, 10, 20, 40])) 20 >>> print(max_diff([-5, 5, 7, 11])) 10