No Flying

Hold space in the last exercise and the hero never comes down. Every frame resets vy to 4, so gravity never gets a chance.

Fix it: only jump when the hero is on the ground.

if keys["space"] and state["y"] == 0:

Now holding the button does nothing extra. You have to land before you can jump again, which is what makes jumping a decision instead of a switch.

The test holds space for six frames straight. A correct answer jumps exactly once.

Expected output

4/3 7/2 9/1 10/0 10/-1 9/-2 7/-3 4/-4 0/-5

Need a hint?

3 available · costs 5 XP each

python

def new_game():

return {"y": 0, "vy": 0}

def update(state, keys):

if keys["space"]: # lets the hero fly — only allow it on the ground

state["vy"] = 4

state["y"] = state["y"] + state["vy"]

state["vy"] = state["vy"] - 1

if state["y"] < 0:

state["y"] = 0

state["vy"] = 0

return state

def draw(state):

grid = blank_grid()

grid[GROUND - state["y"]][6] = "gold"

return grid