Python求利率

要求

编写程序计算在给定利率、指定年数的情况下投资的未来值。这个计算公式如下。

使用文本域输入投资额、年份和利率。当用户单击“calculate”按钮时，在文本域中显示未来的投资值，如图所示。

代码实现

import tkinter as tk

def calculate():
    amount, years, rate = (float(entry.get()) for entry in entries)
    future_value = amount * (1 + rate / 1200) ** (years * 12)
    result.config(state="normal")
    result.delete("1.0", tk.END)
    result.insert(tk.END, f"{
     future_value:.2f}")
    result.config(state="disabled")

def add_row(window, text, row):
    tk.Label(window, text=text).grid(row=row, sticky=tk.W)
    entry = tk.Entry(window)
    entry.grid(row=row, column=1)
    return entry

window = tk.Tk()
window.title("第三次实验")

labels = ["Investment Amount:", "Years:", "Annual Interest Rate:"]
entries = [add_row(window, label, i) for i, label in enumerate(labels)]

result = tk.Text(window, height=1, width=20, state="disabled")
result.grid(row=len(labels), column=1, sticky=tk