pytest.
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.
Notes
The new 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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