使用Tkinter开发数独游戏时重置函数仅清空最后一行Entry问题求助

Hey there! I see the issue with your Sudoku reset function—let's break it down and fix it quickly.

The Root Problem #

The bug comes from how you're initializing your 2D lists col and val. When you use:

col = [[None]*cols]*rows
val = [[IntVar]*cols]*rows

You're not creating 9 independent rows of lists. Instead, all 9 rows are references to the same underlying list. That means when you loop through and assign col[i][j] = Entry(...), you're actually overwriting the same list 9 times. By the end of your loop, every col[i] points to the last row's entries. So when your reset() function runs, it's just clearing that one shared list (which looks like only the last row gets cleared).

The Fix #

Replace those 2D list initializations with list comprehensions, which create a new list for each row:

col = [[None for _ in range(cols)] for _ in range(rows)]
val = [[IntVar() for _ in range(cols)] for _ in range(rows)]

Notice we also call IntVar() instead of just referencing the class—since each entry needs its own IntVar instance, not a reference to the same class object.

Modified Full Code #

Here's your code with the fixes applied (changes marked with # FIXED):

def reset(): 
    for i in range(rows): 
        for j in range(cols): 
            col[i][j].delete(0, "end") 

from Tkinter import Tk, Canvas, Entry, Button, CENTER, IntVar 
root = Tk() 
screen = Canvas(root, height = 430, width = 460) 
screen.pack() 
screen.create_text(200, 15, text = 'SUDOKU', font = 'calibri 20 bold') 
screen.create_line(127, 54, 127, 408) 
screen.create_line(232, 54, 232, 408) 
screen.create_line(24, 170, 336, 170) 
screen.create_line(24, 290, 336, 290) 

check_button = Button(root, text = 'Check', font = 'Calibri 10 bold', bd = 0, bg = 'Green', fg = 'white', padx = 10, pady = 5) 
screen.create_window(400, 70, window = check_button) 

reset_button = Button(root, text = 'Reset', font = 'Calibri 10 bold', bd = 0, bg = 'Red', fg = 'white', padx = 10, pady = 5, command = reset) 
screen.create_window(400, 110, window = reset_button) 

x, y, n = 0, 0, 0 
cols, rows, values = 9, 9, 81 

# FIXED: Use list comprehensions to create independent rows
col = [[None for _ in range(cols)] for _ in range(rows)]
val = [[IntVar() for _ in range(cols)] for _ in range(rows)]

for i in range(rows): 
    x = 0 
    if i == 0: 
        y += 70 
    else: 
        y += 40 
    for j in range(cols): 
        x += 40 
        col[i][j] = Entry(root, width = 2, font = 'Calibri 20', bd = 0, justify = CENTER) 
        screen.create_window(x, y, window = col[i][j]) 
        x -= 5 

root.mainloop()

Why This Works #

List comprehensions generate a new list for each row, so each col[i] is a separate list of Entry widgets. Now when your reset() function loops through every col[i][j], it's accessing the correct Entry for each cell, not just the ones in the last row.

内容的提问来源于stack exchange，提问作者Aakash