用python设计一个窗体，窗体内各对象能进行四则运算

好的，我可以帮你设计一个简单的窗体，用于进行四则运算。你需要安装 Python 的 GUI 库 tkinter。

以下是代码：

import tkinter as tk


class Calculator:
    def __init__(self, master):
        self.master = master
        master.title("四则运算计算器")

        self.entry = tk.Entry(master, width=25, font=("Arial", 16))
        self.entry.grid(row=0, column=0, columnspan=4, padx=5, pady=5)

        self.create_button("1", 1, 0)
        self.create_button("2", 1, 1)
        self.create_button("3", 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("7", 3, 0)
        self.create_button("8", 3, 1)
        self.create_button("9", 3, 2)
        self.create_button("*", 3, 3)
        self.create_button("0", 4, 0)
        self.create_button(".", 4, 1)
        self.create_button("C", 4, 2)
        self.create_button("/", 4, 3)
        self.create_button("=", 5, 0, 1, 4)

    def create_button(self, text, row, column, rowspan=1, columnspan=1):
        button = tk.Button(self.master, text=text, width=5, height=2, font=("Arial", 16),
                           command=lambda: self.button_click(text))
        button.grid(row=row, column=column, rowspan=rowspan, columnspan=columnspan, padx=5, pady=5)

    def button_click(self, text):
        if text == "C":
            self.entry.delete(0, tk.END)
        elif text == "=":
            try:
                result = eval(self.entry.get())
                self.entry.delete(0, tk.END)
                self.entry.insert(0, result)
            except:
                self.entry.delete(0, tk.END)
                self.entry.insert(0, "Error")
        else:
            self.entry.insert(tk.END, text)


root = tk.Tk()
calculator = Calculator(root)
root.mainloop()

运行代码，就可以看到一个简单的四则运算计算器窗体。你可以点击窗体内的按钮进行相应的运算。