Negative step size : Slice « List « Python Tutorial

1. Python Tutorial
2. List
3. Slice

numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

print numbers[8:3:-1] 
print numbers[10:0:-2] 
print numbers[0:10:-2] 
print numbers[::-2] 
print numbers[5::-2] 
print numbers[:5:-2]