如何在GUI中使用split string()为科学计算器编写相等按钮的代码？

from tkinter import *

def calculate():
    expression = entry.get()  # 获取文本框中的表达式字符串
    operators = expression.split("+")  # 使用+操作符进行分割
    numbers = [float(num) for num in expression.split("+") if num.isdigit()]  # 获取数字数组

    result = 0  # 初始化计算结果

    for i in range(len(operators)):
        if operators[i] == "+":
            result += numbers[i]
        elif operators[i] == "-":
            result -= numbers[i]
        elif operators[i] == "*":
            result *= numbers[i]
        elif operators[i] == "/":
            result /= numbers[i]

    entry.delete(0, END)  # 清空文本框
    entry.insert(END, str(result))  # 将计算结果更新到文本框

root = Tk()

entry = Entry(root)
entry.pack()

equal_button = Button(root, text="=", command=calculate)
equal_button.pack()

root.mainloop()