Count down

Write a function count_down that takes a positive integer start as input and returns a list of integers counting down from start to 0.
def count_down(start):
# complete function here...
print(count_down(3)) # expected output: [3,2,1,0] print(count_down(5)) # expected output: [5,4,3,2,1,0]
Python
Setting up Python environment...
Output