请大家用窗体完成加、减、乘、除等计算器功能的程序，其他功能可以继续扩展；

好的，我可以帮您实现一个基本的计算器程序，您可以在窗体中输入数字和操作符，然后点击“=”按钮得到计算结果。以下是示例代码：

import tkinter as tk

# 定义计算器窗口
class Calculator:
    def __init__(self, master):
        self.master = master
        self.master.title("Calculator")

        # 创建输入框
        self.entry = tk.Entry(self.master, width=30)
        self.entry.grid(row=0, column=0, columnspan=4, pady=5)

        # 创建按钮
        self.create_button("7", 1, 0)
        self.create_button("8", 1, 1)
        self.create_button("9", 1, 2)
        self.create_button("/", 1, 3)

        self.create_button("4", 2, 0)
        self.create_button("5", 2, 1)
        self.create_button("6", 2, 2)
        self.create_button("*", 2, 3)

        self.create_button("1", 3, 0)
        self.create_button("2", 3, 1)
        self.create_button("3", 3, 2)
        self.create_button("-", 3, 3)

        self.create_button("0", 4, 0)
        self.create_button(".", 4, 1)
        self.create_button("=", 4, 2)
        self.create_button("+", 4, 3)

        self.create_button("C", 5, 0)
        self.create_button("(", 5, 1)
        self.create_button(")", 5, 2)
        self.create_button("←", 5, 3)

    # 创建按钮并绑定事件
    def create_button(self, text, row, column):
        button = tk.Button(self.master, text=text, width=7, height=2)
        button.grid(row=row, column=column, padx=2, pady=2)

        if text.isdigit():
            button.bind("<Button-1>", self.input_number)
        elif text == ".":
            button.bind("<Button-1>", self.input_dot)
        elif text == "=":
            button.bind("<Button-1>", self.calculate)
        elif text == "C":
            button.bind("<Button-1>", self.clear)
        elif text == "←":
            button.bind("<Button-1>", self.backspace)
        else:
            button.bind("<Button-1>", self.input_operator)

    # 输入数字
    def input_number(self, event):
        self.entry.insert(tk.END, event.widget["text"])

    # 输入小数点
    def input_dot(self, event):
        if "." not in self.entry.get():
            self.entry.insert(tk.END, ".")

    # 输入操作符
    def input_operator(self, event):
        self.entry.insert(tk.END, " " + event.widget["text"] + " ")

    # 计算结果
    def calculate(self, event):
        try:
            result = eval(self.entry.get())
            self.entry.delete(0, tk.END)
            self.entry.insert(tk.END, result)
        except ZeroDivisionError:
            self.entry.delete(0, tk.END)
            self.entry.insert(tk.END, "Error: cannot divide by zero")

    # 清除输入框
    def clear(self, event):
        self.entry.delete(0, tk.END)

    # 删除最后一个字符
    def backspace(self, event):
        text = self.entry.get()[:-1]
        self.entry.delete(0, tk.END)
        self.entry.insert(tk.END, text)

# 启动程序
if __name__ == "__main__":
    root = tk.Tk()
    app = Calculator(root)
    root.mainloop()

这个程序实现了基本的加、减、乘、除运算，以及清空输入框、删除最后一个字符等功能。您可以根据需要自行扩展。