I'm getting some strange errors in my python code

Question

I am making a chess board in python using pygame and since I am relatively new to python and my friend wrote some code we both don't understand we are dumbfounded trying to debug this program.

Here is my error

Traceback (most recent call last):
  File "/home/travisfiorito/Documents/Doggy rewrite/OtherProject/Play-Around/ChessAI/AI.py", line 99, in <module>
    draw_board()
  File "/home/travisfiorito/Documents/Doggy rewrite/OtherProject/Play-Around/ChessAI/AI.py", line 83, in draw_board
    screen.blit(image, (j * square_size, i * square_size))
UnboundLocalError: local variable 'image' referenced before assignment

Here is my code

import sys
import os
import subprocess
import pygame
from PIL import Image
def install(package):
    subprocess.check_call([sys.executable, "-m", "pip", "install", package])

install("pygame")
pygame.init()
os.environ['SDL_AUDIODRIVER'] = 'dsp'
#os.environ["SDL_VIDEODRIVER"] = 'dummy'

image_filenames = ['/path/to/img/black_bishop.png', '/path/to/img/black_king.png', '/path/to/img/black_knight.png', '/path/to/img/black_pawn.png','/path/to/img/black_queen.png','/path/to/img/black_rook.png','/path/to/img/white_bishop.png', '/path/to/img/white_king.png', '/path/to/img/white_knight.png', '/path/to/img/white_pawn.png', '/path/to/img/white_queen.png', '/path/to/img/white_rook.png']
images = {}


window_size = 400
square_size = window_size // 8



pygame.display.set_caption('Scuffed Chess ai')
icon = pygame.Surface((1, 1))
icon.set_alpha(0)
pygame.display.set_icon(icon)
screen = pygame.display.set_mode((window_size, window_size))
screen.fill((255, 255, 255))

global board
board = [
    ['r', 'n', 'b', 'q', 'k', 'b', 'n', 'r'],
    ['p', 'p', 'p', 'p', 'p', 'p', 'p', 'p'],
    [' ', ' ', ' ', ' ', ' ', ' ', ' ', ' '],
    [' ', ' ', ' ', ' ', ' ', ' ', ' ', ' '],
    [' ', ' ', ' ', ' ', ' ', ' ', ' ', ' '],
    [' ', ' ', ' ', ' ', ' ', ' ', ' ', ' '],
    ['P', 'P', 'P', 'P', 'P', 'P', 'P', 'P'],
    ['R', 'N', 'B', 'Q', 'K', 'B', 'N', 'R']
]

selected_piece = None
selected_pos = None
selected_pos = []
images = {filename: pygame.image.load(filename) for filename in image_filenames}
image = None
def draw_board():
    for i in range(8):  # iterate from 0 to 7
        for j in range(8):  # iterate from 0 to 7
            color = (255, 255, 255) if (i + j) % 2 == 0 else (0, 0, 0)
            pygame.draw.rect(screen, color, (i * square_size, j * square_size, square_size, square_size))
    for i in range(8):  # iterate from 0 to 7
        for j in range(8):  # iterate from 0 to 7
            piece = board[i][j]
            if piece != ' ':
                if piece.islower():
                    color = (255, 255, 255)
                else:
                    color = (0, 0, 0)
                if piece == 'p':
                    image = images['black_pawn']
                elif piece == 'r':
                    image = images['black_rook']
                elif piece == 'n':
                    image = images['black_knight']
                elif piece == 'b':
                    image = images['black_bishop']
                elif piece == 'q':
                    image = images['black_queen']
                elif piece == 'k':
                    image = images['black_king']
                elif piece == 'P':
                    image = images['white_pawn']
                elif piece == 'R':
                    image = images['white_rook']
                elif piece == 'N':
                    image = images['white_knight']
                elif piece == 'B':
                    image = images['white_bishop']
                elif piece == 'Q':
                    image = images['white_queen']
                elif piece == 'K':
                    image = images['white_king']
                screen.blit(image, (j * square_size, i * square_size))

running = True
while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
        elif event.type == pygame.MOUSEBUTTONDOWN:
            pos = pygame.mouse.get_pos()
            col = pos[0]
            row = pos[1]
# Inside the mouse click event handling block
        if selected_piece:
            board[selected_pos[0]][selected_pos[1]] = ' '
            selected_pos = [row, col]
            board[row][col] = selected_piece
            selected_piece = None
            draw_board()
        else:
            pos = pygame.mouse.get_pos()
            col = pos[0]
            row = pos[1]
            if board[row][col] != ' ':
                selected_piece = board[row][col]
                selected_pos = [row, col]
                

        if selected_piece:
            # Draw a highlight around the selected piece
            pygame.draw.rect(screen, (255, 0, 0), (selected_pos[1] * square_size, selected_pos[0] * square_size, square_size, square_size), 4)

# Quit pygame
pygame.quit()

I believe I have some issues going on with the scope of calling the variable

I haven't exactly used pygame before and would be happy to use another library if it fixes my issue

I'm getting some strange errors in my python code

0 Answers0