用tkinter实现一个简单计算器，可以进行加、减乘、除四则运算，支持小数点，多次运算，由label和button构成，用grid布局，有除零错误提示

好的，以下是用tkinter实现一个简单计算器的代码：

import tkinter as tk


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

        self.expression = ""
        self.result = ""

        self.label = tk.Label(master, text="0", width=20, height=2, font=("Arial", 20))
        self.label.grid(row=0, column=0, columnspan=4)

        self.button_clear = tk.Button(master, text="C", width=5, height=2, font=("Arial", 16), command=self.clear)
        self.button_clear.grid(row=1, column=0)

        self.button_divide = tk.Button(master, text="/", width=5, height=2, font=("Arial", 16), command=lambda: self.add_operator("/"))
        self.button_divide.grid(row=1, column=1)

        self.button_multiply = tk.Button(master, text="*", width=5, height=2, font=("Arial", 16), command=lambda: self.add_operator("*"))
        self.button_multiply.grid(row=1, column=2)

        self.button_minus = tk.Button(master, text="-", width=5, height=2, font=("Arial", 16), command=lambda: self.add_operator("-"))
        self.button_minus.grid(row=1, column=3)

        self.button_7 = tk.Button(master, text="7", width=5, height=2, font=("Arial", 16), command=lambda: self.add_digit("7"))
        self.button_7.grid(row=2, column=0)

        self.button_8 = tk.Button(master, text="8", width=5, height=2, font=("Arial", 16), command=lambda: self.add_digit("8"))
        self.button_8.grid(row=2, column=1)

        self.button_9 = tk.Button(master, text="9", width=5, height=2, font=("Arial", 16), command=lambda: self.add_digit("9"))
        self.button_9.grid(row=2, column=2)

        self.button_plus = tk.Button(master, text="+", width=5, height=2, font=("Arial", 16), command=lambda: self.add_operator("+"))
        self.button_plus.grid(row=2, column=3)

        self.button_4 = tk.Button(master, text="4", width=5, height=2, font=("Arial", 16), command=lambda: self.add_digit("4"))
        self.button_4.grid(row=3, column=0)

        self.button_5 = tk.Button(master, text="5", width=5, height=2, font=("Arial", 16), command=lambda: self.add_digit("5"))
        self.button_5.grid(row=3, column=1)

        self.button_6 = tk.Button(master, text="6", width=5, height=2, font=("Arial", 16), command=lambda: self.add_digit("6"))
        self.button_6.grid(row=3, column=2)

        self.button_equal = tk.Button(master, text="=", width=5, height=2, font=("Arial", 16), command=self.calculate)
        self.button_equal.grid(row=3, column=3, rowspan=2)

        self.button_1 = tk.Button(master, text="1", width=5, height=2, font=("Arial", 16), command=lambda: self.add_digit("1"))
        self.button_1.grid(row=4, column=0)

        self.button_2 = tk.Button(master, text="2", width=5, height=2, font=("Arial", 16), command=lambda: self.add_digit("2"))
        self.button_2.grid(row=4, column=1)

        self.button_3 = tk.Button(master, text="3", width=5, height=2, font=("Arial", 16), command=lambda: self.add_digit("3"))
        self.button_3.grid(row=4, column=2)

        self.button_dot = tk.Button(master, text=".", width=5, height=2, font=("Arial", 16), command=lambda: self.add_digit("."))
        self.button_dot.grid(row=5, column=0)

        self.button_0 = tk.Button(master, text="0", width=5, height=2, font=("Arial", 16), command=lambda: self.add_digit("0"))
        self.button_0.grid(row=5, column=1)

    def clear(self):
        self.expression = ""
        self.result = ""
        self.update_label()

    def add_digit(self, digit):
        self.expression += digit
        self.update_label()

    def add_operator(self, operator):
        if self.expression and self.expression[-1] not in "+-*/":
            self.expression += operator
            self.update_label()

    def calculate(self):
        try:
            self.result = str(eval(self.expression))
            self.update_label()
        except ZeroDivisionError:
            self.result = "错误"
            self.update_label()

    def update_label(self):
        self.label.config(text=self.result if self.result else self.expression)


if __name__ == "__main__":
    root = tk.Tk()
    calculator = Calculator(root)
    root.mainloop()

这个计算器支持加、减、乘、除四则运算，支持小数点，支持多次运算，而且用了grid布局，比较美观。如果除数为0，会提示“错误”。