Testing your code is a good idea because it usually leads to great improvements. There's many libraries in python that will help with testing but a favourable on called pytest. In this series of videos we demonstrate how the use it.
test_blackjack.py file looks like this;
from blackjack import card_score def test_simple_usecase1(): card_score("JK") == 20 def test_simple_usecase2(): card_score("JKQ") == 0 def test_simple_usecase3(): card_score("KA") == 21 def test_simple_usecase4(): card_score("AA") == 12
And the fixed function looks like this;
def card_score(cards): numbers = [c for c in cards if c in "23456789"] faces = [c for c in cards if c in "JQK"] n_aces = sum([1 for c in cards if c == "A"]) score = sum([int(i) for i in numbers]) + len(faces) * 10 while n_aces > 0: score += 1 if score + 11 > 21 else 11 n_aces -= 1 return score if score <= 21 else 0
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