I am not sure what I am missing. The error says I am not hurting when hitting the wall.

Question

Our move function takes this three-part tuple player and a direction tuple that's two parts, the x to move and the y (like (-1, 0) would move to the left but not up or down).

Finish the function so that if the player is being run into a wall, their hp is reduced by 5. Don't let them go past the wall. Consider the grid to be 0-9 in both directions. Don't worry about keeping their hp above 0 either.

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
    if direction == (-1,0):
        x-=1
    elif direction == (1,0):
        x+=1
    elif direction == (0,1):
        y+=1
    elif direction == (0,-1):
        y-=1
    elif direction == (-1,0) and x == 0:
        x = 0
        hp -= 5
    elif direction == ( 1,0) and x == 9:
        x = 9
        hp -= 5
    elif direction ==  (0,-1) and y == 0:
        y=0
        hp -= 5
    elif direction == (0,1) and y == 9:
        y=9
        hp -=5



    return x, y, hp

Answer 1 · 2019-04-17T16:29:17Z

April 17, 2019 4:29pm

Remember that an "if/elif" chain is efficient because it stops testing when any condition is met. And the first few tests look only at direction, so if they match, they will change a coordinate and not change the hp, even if a wall is being hit.

A few things to keep in mind while implementing this function:

don't assume the movement will be in only one direction
don't assume the motion will be only one step
check for wall collisions first
if a wall would be hit, change the hp but not the location

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Jordon Crichton

Jordon Crichton

I am not sure what I am missing. The error says I am not hurting when hitting the wall.

1 Answer

Steven Parker

Steven Parker