2. Looping backward

Avoid awkward -1 bounds when iterating backward. Use reversed to make the code clearer.

reversed states the direction change without exposing the indexing mechanics needed to accomplish it. That makes the loop easier to inspect and less error-prone when the sequence bounds change.

2.1. Don’t do this

names = ['john', 'jane', 'jeremy', 'janice', 'joyce', 'jonathan']

for i in range(len(names) - 1, -1, -1):
    print(names[i])

2.2. Do this

names = ['john', 'jane', 'jeremy', 'janice', 'joyce', 'jonathan']

for name in reversed(names):
    print(name)