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我正在尝试构建一个简单的计算器。t1我想在文本框中插入一个计算。例如，如果t2文本框和t3文本框被填充或更改t3文本框会自动进行计算。如何让我的t1文本框有一个 while 循环来连续计算其他两个框中的值？

这是我的代码，如果有什么令人困惑的地方，请告诉我！谢谢！

import tkinter as tk
import tkinter.font as TkFont

root = tk.Tk()
#helv36 = TkFont.Font(family="courier new",size=10,weight="bold")

#e1 = tk.Text(root, bg='black', fg='white', font=helv36)
#e1.pack()
#row=0, column=0, rowspan=0, columnspan=0




def open_pl():
    pl = tk.Toplevel()
    pl.title('P/L')
    pl.geometry('305x255')


    #label
    l1 = tk.Label(pl, text='Profit/Loss Calculator', padx=90, pady=4).grid(row=0, column=0,columnspan=2)
    l2 = tk.Label(pl, text='Initial Balance: ',justify='left', anchor='w').grid(row=2, column=0, sticky='w')
    l3 = tk.Label(pl, text='Balance: ',justify='left', anchor='w').grid(row=3, column=0, sticky='w')
    l4 = tk.Label(pl, text='thinkorswim: ********', padx=85, pady=4).grid(row=5, column=0,columnspan=2)

    #text box
    t1 = tk.Text(pl, height=2, width=20, padx=70, pady=15)
    t2 = tk.Text(pl, height=2, width=20, padx=20).grid(row=2, column=1,columnspan=4)
    t3 = tk.Text(pl, height=2, width=20, padx=20).grid(row=3, column=1,columnspan=4)
    t4 = tk.Text(pl, height=2, width=20, padx=70, pady=15).grid(row=4, column=0,columnspan=2)


    t1.grid(row=1, column=0,columnspan=2)

    # i tried it here
    while t3 != 0:
        initial_balance = t2.get('1.0', INSERT)
        balance = t3.get('1.0', INSERT)
        t1.insert('1.0', (float(balance)-float(initial_balance))/float(initial_balance))





menubar = tk.Menu(root)
m1 = tk.Menu(menubar, tearoff=0)
m1.add_command(label="P/L", command=open_pl)
menubar.add_cascade(label="Tools", menu=m1)
root.config(menu=menubar)

root.mainloop()
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