代码：

import tkinter as tkclass Calculator:def __init__(self, master):self.master = mastermaster.title("Calculator")self.total = tk.StringVar()self.entered_number = tk.StringVar()self.entered_number.set('0')self.total.set('0')self.entry = tk.Entry(master, textvariable=self.entered_number)self.entry.grid(row=0, column=0, columnspan=4, padx=10, pady=10, ipadx=10, ipady=10)self.create_button("1", 1, 1)self.create_button("2", 1, 2)self.create_button("3", 1, 3)self.create_button("4", 2, 1)self.create_button("5", 2, 2)self.create_button("6", 2, 3)self.create_button("7", 3, 1)self.create_button("8", 3, 2)self.create_button("9", 3, 3)self.create_button("0", 4, 2)self.create_button("+", 1, 4)self.create_button("-", 2, 4)self.create_button("*", 3, 4)self.create_button("/", 4, 4)self.create_button("C", 4, 1)self.create_button("=", 4, 3)def create_button(self, text, row, column):button = tk.Button(self.master, text=text, command=lambda: self.button_click(text))button.grid(row=row, column=column, padx=10, pady=10)def button_click(self, text):if text == '=':try:self.total.set(eval(self.entry.get()))self.entered_number.set(self.total.get())except:self.total.set("Error")self.entered_number.set("Error")elif text == 'C':self.entered_number.set('0')self.total.set('0')else:if self.entered_number.get() == '0':self.entered_number.set('')self.entered_number.set(self.entered_number.get() + text)root = tk.Tk()
my_gui = Calculator(root)
root.mainloop()

运行结果：