利用python GUI之tkinter编写界面计算器,基于面向对象编程，编写一个具备+、-、*、/四则运算的计算器，要求采用连续计算模式

（即支持多次连续计算）。

以下是代码实现：

import tkinter as tk

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

        # 创建显示框
        self.display = tk.Entry(master, width=24, font=('Arial', 16))
        self.display.grid(row=0, column=0, columnspan=4, pady=10)

        # 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("C", 4, 2)
        self.create_button("+", 4, 3)

        self.create_button("=", 5, 0, columnspan=4)

        # 初始化变量
        self.result = 0
        self.operator = "+"
        self.is_new_number = True

    def create_button(self, text, row, column, rowspan=1, columnspan=1):
        button = tk.Button(self.master, text=text, width=6, 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.isdigit() or text == ".":
            if self.is_new_number:
                self.display.delete(0, tk.END)
                self.is_new_number = False
            self.display.insert(tk.END, text)
        elif text == "C":
            self.display.delete(0, tk.END)
            self.result = 0
            self.operator = "+"
        elif text in ["+", "-", "*", "/"]:
            self.calculate()
            self.result = float(self.display.get())
            self.operator = text
            self.is_new_number = True
        elif text == "=":
            self.calculate()
            self.operator = "+"
            self.is_new_number = True

    def calculate(self):
        number = float(self.display.get())
        if self.operator == "+":
            self.result += number
        elif self.operator == "-":
            self.result -= number
        elif self.operator == "*":
            self.result *= number
        elif self.operator == "/":
            self.result /= number
        self.display.delete(0, tk.END)
        self.display.insert(tk.END, str(self.result))

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

运行程序，即可得到一个简单的计算器界面。