I’m trying to do collision detection over the members of a list of turtles, so that a variable returns a Boolean to break a while true loop. It works with ONE of the turtles, but not the others. It also only prints the distance (for debug) for the one that collision works with. What’s confusing is the exact same syntax used in the collision function works just fine in the ball/wall collision detection loops.

import turtle
from turtle import Screen
import random
from random import randrange

screen = turtle.Screen()
screen.setup(500, 500)
screen.title('Balls Bounce')

friend = turtle.Turtle()
friend.shape('turtle')
friend.color('green')
friend.turtlesize(3)

def friendUp():
    friend.setheading(90)
    friend.forward(45)

def friendDown():
    friend.setheading(270)
    friend.forward(45)

def friendRight():
    friend.setheading(0)
    friend.forward(45)

def friendLeft():
    friend.setheading(180)
    friend.forward(45)

screen.onkey(friendUp, "Up")
screen.onkey(friendLeft, "Left")
screen.onkey(friendRight, "Right")
screen.onkey(friendDown, "Down")
screen.listen()

def createBall():
    ball = turtle.Turtle(shape="circle")
    ball.penup()
    ball.color("Red")
    ball.turtlesize(3)
    ball.setheading(randrange(361))
    ball.forward(5)
    return ball

balls = []
for i in range(5):
    b = createBall()
    balls.append(b)

bodySize = 80
halfBodySize = bodySize / 2
collisionDistance = 5
isCollision = False

def collision(balls, friend):
    distance = 0
    for b in balls:
        distance = b.distance(friend)
        print(distance // 1)
        if distance < halfBodySize:
            print('Collision!')
            global isCollision
            isCollision = True
            break
        return isCollision

while True:
    collision(balls, friend)
    if isCollision == True:
        break
    for b in balls:
        b.forward(5)
        xPos = b.position()[0]
        yPos = b.position()[1]
        if xPos > 250 or xPos < -250:
            b.forward(-5)
            b.setheading(randrange(361))
        if yPos > 250 or yPos < -250:
            b.forward(-5)
            b.setheading(randrange(361))

screen.mainloop()

I’ve tried using map and enumerate, but they keep returning issues that I can’t seem to figure out. For instance, using enumerate returns tuple issues, and I’m not sure I set up the syntax for it correctly. Map has similar issues.