Memory Game - Python Code

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import tkinter as tk
import tkinter.messagebox
import random

# Constants
GRID_SIZE, CARD_SIZE = 5, 100
NUM_PAIRS = (GRID_SIZE * GRID_SIZE) // 2
COLORS = {"hidden": "gray", "revealed": "lightblue", "matched": "green"}

# Shuffle card values
card_values = list(range(1, NUM_PAIRS + 1)) * 2
random.shuffle(card_values)

# Game state
first_pick, second_pick = None, None
revealed = [[False] * GRID_SIZE for _ in range(GRID_SIZE)]
buttons = [[None] * GRID_SIZE for _ in range(GRID_SIZE)]

# Tkinter setup
root = tk.Tk()
root.title("Memory Card Game")


def check_win():
    if all(all(row) for row in revealed):
        tkinter.messagebox.showinfo("Congratulations!", "You won!")
        root.quit()


def on_card_click(r, c):
    global first_pick, second_pick

    if revealed[r][c]:
        return

    buttons[r][c].config(
        text=str(card_values[r * GRID_SIZE + c]),
        bg=COLORS["revealed"],
        state="disabled",
    )
    revealed[r][c] = True

    if not first_pick:
        first_pick = (r, c)
    elif not second_pick:
        second_pick = (r, c)
        root.after(500, compare_cards)


def compare_cards():
    global first_pick, second_pick
    r1, c1, r2, c2 = *first_pick, *second_pick

    if card_values[r1 * GRID_SIZE + c1] == card_values[r2 * GRID_SIZE + c2]:
        buttons[r1][c1].config(bg=COLORS["matched"])
        buttons[r2][c2].config(bg=COLORS["matched"])
    else:
        for r, c in [first_pick, second_pick]:
            buttons[r][c].config(text="", bg=COLORS["hidden"], state="normal")
            revealed[r][c] = False

    first_pick, second_pick = None, None
    check_win()


# Create grid buttons
for r in range(GRID_SIZE):
    for c in range(GRID_SIZE):
        buttons[r][c] = tk.Button(
            root,
            text="",
            width=6,
            height=3,
            bg=COLORS["hidden"],
            command=lambda r=r, c=c: on_card_click(r, c),
        )
        buttons[r][c].grid(row=r, column=c, padx=5, pady=5)

root.mainloop()