Answer: Python Puzzler #309

The answer is D. The program prints:

Full speed ahead!

Checked by running the program for real.

Python checks the conditions from the top and runs the first one that is true. Is 20 > 14? Yes.

A trace table follows the program step by step. Here’s this one:

question	answer
battery > 14	True
battery > 10	True

battery = 20
if battery > 14:
    print("Full speed ahead!")
elif battery > 10:
    print("Slow and steady.")
else:
    print("Time to recharge!")

Try it: change one number in the program and predict the new output before you run it.