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You mastered iterables, didn't you? Then it's time for generators and the spell yield!

Quiz

Which code sample correctly uses the yield keyword in Python to make a count-down?

Sample 1

def count_down(number):
    while number > 0:
        yield number
        number -= 1

for count in count_down(5):
    print(count)

Sample 2

def count_down(number):
    for i in range(number):
        return i

for count in count_down(5):
    print(count)

Post your answer in the comments – is it 0 for the first sample or 1 for the second! As usually, the correct answer will be explained in the comments.