Python 6.6 : Exercise : Conditions

Now that the math game prints a score, we want it to react to that score with a personalised message. The exercise is to compare the number of points with the number of questions: a perfect score prints "Excellent", zero points prints "You have to revise your math". For the cases in between, we compute the half-average (the number of questions divided by two) and decide between "Not bad" and "Can do better". Try it on your own, then look at the correction.

Chaining the conditions

In the correction we chain if, elif and else. The first branch checks the perfect score, the second the zero score. Then we compute the average. Because dividing 5 by 2 returns the float 2.5, we cast it to int so the comparison stays clean. The third branch handles the case where the score is above this threshold, and the final else covers the remaining situation.

if nb_points == NUMBER_OF_QUESTIONS:
    print("Excellent")
elif nb_points == 0:
    print("You have to revise your math")
else:
    average = int(NUMBER_OF_QUESTIONS / 2)
    if nb_points > average:
        print("Not bad")
    else:
        print("Can do better")

We can validate every branch by playing a few rounds. A perfect 5/5 prints "Excellent". A 4/5 still prints "Not bad". A 2/5 prints "Can do better". And typing only wrong answers ends with "You have to revise your math". The final message gives a nice closing to the session. In the next video we will let the user choose between addition and multiplication so the game becomes a little richer.