# [SOLVED] Help with sowing fire

I am not building traps, do you know why. Thanks!

``````# Goal: build three rows of nine fire-traps.

# Returns "retreat", "attack", "start-next-trap-column", or "build-next-trap-in-column"
def chooseStrategy():
enemies = hero.findEnemies()

# If there are overwhelming ogre forces, return the "retreat" strategy.
if len(enemies) > 20:
return "retreat"

# If there are some ogres, return the "attack" strategy.
if len(enemies) < 20:
return "attack"
# Use x % 9 is 0 to see if x is divisible by 9.
# Use len(self.built) to see how many traps you have built.
# If you have finished a column of 9 traps, return "start-next-trap-column"
x = len(self.built) % 9
if x == 0:
return "start-next-trap-column"
# Otherwise, return "build-next-trap-in-column"
else:
return "build-next-trap-in-column"

trapsInColumn = 9
startX = 40
columnX = startX

# Build the next trap in a column in the correct place.
def buildNextTrapInColumn(columnX,numTraps):
# Change newY to use % to wrap around and only build trapsInColumn (9) traps per column
newY = numTraps % 9 # ∆ Change this to use % 9!
if hero.pos.y < newY:
hero.move({"x": columnX - 5, "y": newY})
else:
buildTrap(columnX,newY)

# Start a new column of traps.
def startNextTrapColumn(columnX, numTraps):
newX = startX - (Math.floor(numTraps / trapsInColumn) * 6)
if hero.pos.y > 10:
hero.move({"x": newX - 5, "y": 10})
return columnX
else:
buildTrap(newX,10)
return newX

def buildTrap(x, y):
hero.buildXY("fire-trap", x, y)

def commandAttack():
# Have your griffin riders fend off the attackers.
friends = hero.findFriends()
for friend in friends:
enemy = hero.findNearestEnemy()
if enemy:
hero.command(friend, "attack", enemy)
pass

def commandRetreat():
hero.say("Retreat!")
# You and your griffin riders retreat to safety behind the traps.
hero.moveXY(4, 42)
friends = hero.findFriends()
for friend in friends:
hero.command(friend, "move", {"x": 4, "y": 42})

while True:
strategy = chooseStrategy()
if strategy == "attack":
commandAttack()
elif strategy == "build-next-trap-in-column":
buildNextTrapInColumn(columnX, len(hero.built))
elif strategy == "start-next-trap-column":
columnX = startNextTrapColumn(columnX, len(hero.built))
elif strategy == "retreat":
commandRetreat()

``````

This is a problem I found as well, It’s a very simple solution once you know what it is but before that it seems impossible, It’s just one mistake in the `chooseStrategy()` which is you need to check if there’s an enemy or enemies as well as checking if the len(enemies) < 20: because if there are no enemies then that still counts as len(enemies) < 20 because 0 enemies is still < 20. I think everything else is right.
Hope this helps!

I did what you said. But when I run the code my hero moves places the firetrap than runs into it.
This is the code I used.

``````if len(enemies) < 20 and len(enemies) != 0:
return "attack"
``````

Sorry, there was one other thing I forgot, It’s the newY = numTraps % 9 which is wrong, it should also have 7 * and + 10 before and after it you don’t delete anything that was there before you just add (numTraps % 9) in the middle. Sorry I just forgot about that completely.

Thanks! It is working now!