使用tkinter制作一个简单的计算器，能完成浮点数的加减乘除计算。(一个浮点数不能包含两个小数点)

好的，下面是一个使用tkinter制作的简单计算器的代码：

import tkinter as tk

class Calculator:
    def __init__(self, master):
        self.master = master
        self.master.title("Calculator")
        self.master.resizable(width=False, height=False)

        self.display = tk.Entry(self.master, width=20, justify='right', font=('Arial', 16))
        self.display.grid(row=0, column=0, columnspan=4, padx=5, pady=5)

        self.buttons = [
            '7', '8', '9', '/',
            '4', '5', '6', '*',
            '1', '2', '3', '-',
            '0', '.', '=', '+'
        ]

        for row in range(4):
            for col in range(4):
                index = row * 4 + col
                button = tk.Button(self.master, text=self.buttons[index], width=4, height=2, font=('Arial', 16))
                button.grid(row=row+1, column=col, padx=5, pady=5)
                button.bind('<Button-1>', self.button_click)

        self.reset()

    def reset(self):
        self.operator = None
        self.operand = 0.0
        self.display.delete(0, tk.END)

    def button_click(self, event):
        text = event.widget['text']
        if text.isdigit() or text == '.':
            if '.' in self.display.get() and text == '.':
                return
            self.display.insert(tk.END, text)
        elif text in '+-*/':
            self.operand = float(self.display.get())
            self.operator = text
            self.display.delete(0, tk.END)
        elif text == '=':
            if self.operator is None:
                return
            result = 0.0
            if self.operator == '+':
                result = self.operand + float(self.display.get())
            elif self.operator == '-':
                result = self.operand - float(self.display.get())
            elif self.operator == '*':
                result = self.operand * float(self.display.get())
            elif self.operator == '/':
                result = self.operand / float(self.display.get())
            self.display.delete(0, tk.END)
            self.display.insert(tk.END, str(result))
            self.operator = None
        elif text == 'C':
            self.reset()

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

运行上述代码，即可弹出一个简单的计算器界面，可以进行浮点数的加减乘除计算。