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Python Python Collections (2016, retired 2019) Dungeon Game Hit points

move function help needed (challenge)

Hi all,

It seems that everything goes right in this code except for a player in the middle of the board. If a player is in the middle, I get this message: Bummer: Hmm, a player in the middle of the board took damage.

Does anyone know why?

movement.py
# EXAMPLES:
# move((1, 1, 10), (-1, 0)) => (0, 1, 10)
# move((0, 1, 10), (-1, 0)) => (0, 1, 5)
# move((0, 9, 5), (0, 1)) => (0, 9, 0)

def move(player, direction):
    x, y, hp = player
    a, b = direction
    if (x+a) or (y+b) < 0:
        hp -= 5
    elif (x+a) or (y+b) > 9:
        hp -= 5
    else:
        x = x+a
        y = y+b
    return x, y, hp

1 Answer

Steven Parker
Steven Parker
229,657 Points

When you combine tests using logic operators, both sides of the logic operator need to be complete comparisons:

# so instead of this:
    if (x+a) or (y+b) < 0:
# you would write this:
    if (x+a) < 0 or (y+b) < 0:

Otherwise the rules for "truthiness" apply (anything other than 0 is "truthy").

thank you so much! that was driving me crazy.