[Tutor] problems finding position in list and changing it for GO game

[Lee Meredith]

Hi
I am looking for some help if you have or worked with pygame or not
I'm sure if you have not you could still help me
I am working on a  *GO game* no AI a analog behavior only
I have the stones going to the board and switching colors between black and
white
but I want to take *stones/pieces* off and count them
and if you don't play go it's okay as well but might help

the MOUSEBUTTONDOWN gives the black0 XandYpositions with the*.append*
how do I reference the address in the list by using XandYpositions
Then replace them or take it out off the list

This code puts out an error when you hit the letter "b"

Traceback (most recent call last):
  File "C:/Users/Lee/Desktop/pyGame01/GO/GO_1_2_3.py", line 46, in <module>
    for stone in len(black0):
TypeError: 'int' object is not iterable

Which I'm not really sure what that means or how to remedy it as well

Thank you everyone

## geting there black and white stones alternate now the issue
## of taking the stones off the board
## Or more precisely to .insert into the list at an address that I detected
by finding the X. and the Y. by using the
## if event.pos == range( black0[stone][0] - (stoneWidth/2),
black0[stone][0] + ((stoneWidth/2)+1)):
import pygame
from pygame.locals import *
from sys import exit
pygame.init()
screen = pygame.display.set_mode((758, 758), 0, 32)
##Color
color0 = (0,255)

b = 0

white0 = [] #white0
black0 = [] #black0

stoneWidth = 20

while True:
    pressed_keys = pygame.key.get_pressed()
    for event in pygame.event.get():
        if event.type == QUIT:
            exit()
        if event.type == MOUSEBUTTONDOWN:##makes a variable out of the X.
and Y. coordinates
            if b==0:
                b=1
                black0.append(event.pos)##black0.append [X. and Y.]
                black1.append(event.pos)
                print "black points1"
                print black0
                print
            else:
                b=0
                white0.append(event.pos)
                white1.append(event.pos)
                print "white points"
                print white0
                print
        if event.type == KEYDOWN:
            if event.key == K_b:
                print "cut black"
                for stone in len(black0):##I'm not sure here either   is
this the way I would look for detection of mouse in the range
Circle                    if event.pos == range( black0[stone][0] -
(stoneWidth/2), black0[stone][0] + ((stoneWidth/2)+1)):
                        ## this is where I get confused what should I do
<<<<<<<
                        ## black0.insert(event.pos,0)
                    if event.pos == range( black0[stone][1] -
(stoneWidth/2), black0[stone][1] + ((stoneWidth/2)+1)):
                        ## this is where I get confused what should I do
<<<<<<<
                        ##black0.insert(event.pos,1)

    screen.fill((229,181,83))
    screen.lock()
    for white in white0: #you're drawing
        pygame.draw.circle(screen, (color0[1],color0[1],color0[1]), white,
20)
    for black in black0:
        pygame.draw.circle(screen, (color0[0],color0[0],color0[0]), black,
20)
    screen.unlock()
    pygame.display.update()
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