9. Looping over two collections

The key is to avoid accessing elements by indicies and also managing the concern of which list is smaller than which. Use zip to iterate over the two lists; the iteration will only go until the end of the shorter list.

9.1. Don’t do this

names = ['john', 'jane', 'jeremy', 'janice', 'joyce', 'jonathan']
colors = ['red', 'green', 'blue', 'orange', 'purple', 'pink']

n = min(len(names), len(colors))
for i in range(n):
    print(names[i], colors[i])

9.2. Do this

names = ['john', 'jane', 'jeremy', 'janice', 'joyce', 'jonathan']
colors = ['red', 'green', 'blue', 'orange', 'purple', 'pink']

for name, color in zip(names, colors):
    print(name, color)