用tkinter实现一个简单计算器，支持小数点，多次运算，由label和button构成，grid布局

好的，下面是一个简单的计算器示例代码，使用 tkinter 实现，支持小数点，多次运算：

import tkinter as tk

class Calculator(tk.Frame):
    def __init__(self, master=None):
        super().__init__(master)
        self.master = master
        self.master.title("Calculator")
        self.pack()
        self.create_widgets()

    def create_widgets(self):
        # 创建显示结果的标签
        self.result_label = tk.Label(self, text="0", width=20, height=2, bg="white", font=("Arial", 18))
        self.result_label.grid(row=0, column=0, columnspan=4, padx=10, pady=10)

        # 创建按钮
        self.button_1 = tk.Button(self, text="1", width=5, height=2, command=lambda:self.add_number("1"))
        self.button_2 = tk.Button(self, text="2", width=5, height=2, command=lambda:self.add_number("2"))
        self.button_3 = tk.Button(self, text="3", width=5, height=2, command=lambda:self.add_number("3"))
        self.button_4 = tk.Button(self, text="4", width=5, height=2, command=lambda:self.add_number("4"))
        self.button_5 = tk.Button(self, text="5", width=5, height=2, command=lambda:self.add_number("5"))
        self.button_6 = tk.Button(self, text="6", width=5, height=2, command=lambda:self.add_number("6"))
        self.button_7 = tk.Button(self, text="7", width=5, height=2, command=lambda:self.add_number("7"))
        self.button_8 = tk.Button(self, text="8", width=5, height=2, command=lambda:self.add_number("8"))
        self.button_9 = tk.Button(self, text="9", width=5, height=2, command=lambda:self.add_number("9"))
        self.button_0 = tk.Button(self, text="0", width=5, height=2, command=lambda:self.add_number("0"))
        self.button_dot = tk.Button(self, text=".", width=5, height=2, command=lambda:self.add_number("."))
        self.button_plus = tk.Button(self, text="+", width=5, height=2, command=lambda:self.add_operator("+"))
        self.button_minus = tk.Button(self, text="-", width=5, height=2, command=lambda:self.add_operator("-"))
        self.button_multiply = tk.Button(self, text="×", width=5, height=2, command=lambda:self.add_operator("*"))
        self.button_divide = tk.Button(self, text="÷", width=5, height=2, command=lambda:self.add_operator("/"))
        self.button_clear = tk.Button(self, text="C", width=5, height=2, command=self.clear)
        self.button_equal = tk.Button(self, text="=", width=5, height=2, command=self.calculate)

        # 按钮布局
        self.button_1.grid(row=1, column=0, padx=5, pady=5)
        self.button_2.grid(row=1, column=1, padx=5, pady=5)
        self.button_3.grid(row=1, column=2, padx=5, pady=5)
        self.button_plus.grid(row=1, column=3, padx=5, pady=5)
        self.button_4.grid(row=2, column=0, padx=5, pady=5)
        self.button_5.grid(row=2, column=1, padx=5, pady=5)
        self.button_6.grid(row=2, column=2, padx=5, pady=5)
        self.button_minus.grid(row=2, column=3, padx=5, pady=5)
        self.button_7.grid(row=3, column=0, padx=5, pady=5)
        self.button_8.grid(row=3, column=1, padx=5, pady=5)
        self.button_9.grid(row=3, column=2, padx=5, pady=5)
        self.button_multiply.grid(row=3, column=3, padx=5, pady=5)
        self.button_dot.grid(row=4, column=0, padx=5, pady=5)
        self.button_0.grid(row=4, column=1, padx=5, pady=5)
        self.button_clear.grid(row=4, column=2, padx=5, pady=5)
        self.button_divide.grid(row=4, column=3, padx=5, pady=5)
        self.button_equal.grid(row=5, column=0, columnspan=4, padx=5, pady=5)

        # 计算器状态变量
        self.current_number = "0"
        self.operator = None
        self.result = None

    def add_number(self, number):
        # 添加数字到当前数字串
        if self.current_number == "0":
            self.current_number = number
        else:
            self.current_number += number
        self.result_label.config(text=self.current_number)

    def add_operator(self, operator):
        # 记录当前运算符，并计算结果
        if self.result is None:
            self.result = float(self.current_number)
        else:
            self.calculate()
        self.current_number = "0"
        self.operator = operator

    def clear(self):
        # 清空计算器状态
        self.current_number = "0"
        self.operator = None
        self.result = None
        self.result_label.config(text=self.current_number)

    def calculate(self):
        # 计算结果
        if self.operator is None:
            self.result = float(self.current_number)
        elif self.operator == "+":
            self.result += float(self.current_number)
        elif self.operator == "-":
            self.result -= float(self.current_number)
        elif self.operator == "*":
            self.result *= float(self.current_number)
        elif self.operator == "/":
            self.result /= float(self.current_number)
        self.current_number = str(self.result)
        self.operator = None
        self.result_label.config(text=self.current_number)

if __name__ == '__main__':
    root = tk.Tk()
    app = Calculator(master=root)
    app.mainloop()

运行上述代码，即可看到简单的计算器界面。