“=”按钮不在应有的位置

Question

“=”按钮应该位于 9,6,3 列，而无论我做什么，它只是不断被推到右侧的“+”按钮中。这是代码：

import tkinter as tk
import math

# Create the main window
root = tk.Tk()
root.title("Simple Calculator")

# Define button height, width, and padding
BUTTON_HEIGHT = 2
BUTTON_WIDTH = 5
BUTTON_PADDING = (10, 0)  # Padding from top

# Create entry widget
entry = tk.Entry(root, width=20, font=("Arial", 14))
entry.grid(row=0, column=0, columnspan=5, pady=BUTTON_PADDING)  # Add some padding to top

def button_click(value):
    current = entry.get()
    entry.delete(0, tk.END)
    entry.insert(0, current + value)

def clear():
    entry.delete(0, tk.END)

def calculate():
    try:
        result = eval(entry.get())
        entry.delete(0, tk.END)
        entry.insert(0, str(result))
    except Exception as e:
        entry.delete(0, tk.END)
        entry.insert(0, "Error")

def square_root():
    try:
        value = float(entry.get())
        result = math.sqrt(value)
        entry.delete(0, tk.END)
        entry.insert(0, str(result))
    except Exception as e:
        entry.delete(0, tk.END)
        entry.insert(0, "Error")

# Create clear button to the left of the % button
tk.Button(root, text='C', width=BUTTON_WIDTH, height=BUTTON_HEIGHT, command=clear).grid(row=1, column=0)

# Create % button above the number buttons in the top-left corner
tk.Button(root, text='%', width=BUTTON_WIDTH, height=BUTTON_HEIGHT, command=lambda: button_click('%')).grid(row=1, column=1)

# Create square root button to the right of the % button
tk.Button(root, text='√', width=BUTTON_WIDTH, height=BUTTON_HEIGHT, command=square_root).grid(row=1, column=2)

# Create buttons for numbers
numbers = [
    '7', '8', '9',
    '4', '5', '6',
    '1', '2', '3',
    '.', '0', '='
]

row_num = 2
col_num = 0

for number in numbers:
    if number == '=':
        tk.Button(root, text=number, width=BUTTON_WIDTH, height=BUTTON_HEIGHT, command=calculate).grid(row=row_num, column=col_num, columnspan=2)
        col_num += 2  # Increment column number by 2
    else:
        tk.Button(root, text=number, width=BUTTON_WIDTH, height=BUTTON_HEIGHT, command=lambda value=number: button_click(value)).grid(row=row_num, column=col_num)
        col_num += 1
    if col_num > 2:  # Check if column number exceeds 2
        col_num = 0  # Reset column number
        row_num += 1  # Move to the next row

# Create buttons for operations
operations = [
    '/', '*', '-', '+', 
]

# Update the initial row and column numbers for operation buttons
row_num = 2
col_num = 3

for operation in operations:
    tk.Button(root, text=operation, width=BUTTON_WIDTH, height=BUTTON_HEIGHT, command=lambda value=operation: button_click(value)).grid(row=row_num, column=col_num)
    row_num += 1

# Run the main loop
root.mainloop()

我试图解决这个问题，但问题却变得越来越糟。如果有人愿意帮忙的话，那真的会有帮助（我什至尝试使用 ChatGPT 但问题无法解决）。

Answer 1

问题是由链式

columnspan=2

方法中添加

.grid

引起的：

for number in numbers:
    if number == '=':
        tk.Button(root, text=number, width=BUTTON_WIDTH, height=BUTTON_HEIGHT, 
                  command=calculate).grid(row=row_num, column=col_num, columnspan=2)

摆脱它，一切都会好起来的。也就是说，您也许可以从更简单的设置中受益。循环遍历包含您的

buttons

的单个列表，然后从

command

中获取正确的

dict

:

# delete all between `def square_root()` and `def square_root()` and insert:

# list of lists (desired grid)
buttons = [
    ['C', '%', '√'],
    ['7', '8', '9', '/'],
    ['4', '5', '6', '*'],
    ['1', '2', '3', '-'],
    ['.', '0', '=', '+']
]

# dict with custom commands
custom_commands = {
    'C': clear,
    '%': lambda: button_click('%'),
    '√': square_root,
    '=': calculate
    }

# skip n rows
row_skip = 1

# loop `buttons`, add `command` from `dict` (`default` for numbers), create `tk.Button`
for row, button_list in enumerate(buttons):
    for column, button in enumerate(button_list):
        command = custom_commands.get(button, lambda value = button: button_click(value))
        tk.Button(root, text = button, width = BUTTON_WIDTH, height = BUTTON_HEIGHT,
                  command = command)\
            .grid(row = row_skip + row, column = column)