使用tkinter实现简易计算器：1、实现加、减、乘、除以及整除、幂运算和平方根运/2、单击clear按钮时清除文本框中的表达式，单击=按钮时计算文本框中表达式的值

好的，我可以帮你实现这个功能。以下是代码实现：

from tkinter import *
from math import sqrt

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

        self.entry = Entry(master, width=30, borderwidth=5)
        self.entry.grid(row=0, column=0, columnspan=4, padx=10, pady=10)

        # 定义按钮
        self.button_1 = Button(master, text="1", padx=40, pady=20, command=lambda: self.button_click(1))
        self.button_2 = Button(master, text="2", padx=40, pady=20, command=lambda: self.button_click(2))
        self.button_3 = Button(master, text="3", padx=40, pady=20, command=lambda: self.button_click(3))
        self.button_4 = Button(master, text="4", padx=40, pady=20, command=lambda: self.button_click(4))
        self.button_5 = Button(master, text="5", padx=40, pady=20, command=lambda: self.button_click(5))
        self.button_6 = Button(master, text="6", padx=40, pady=20, command=lambda: self.button_click(6))
        self.button_7 = Button(master, text="7", padx=40, pady=20, command=lambda: self.button_click(7))
        self.button_8 = Button(master, text="8", padx=40, pady=20, command=lambda: self.button_click(8))
        self.button_9 = Button(master, text="9", padx=40, pady=20, command=lambda: self.button_click(9))
        self.button_0 = Button(master, text="0", padx=40, pady=20, command=lambda: self.button_click(0))

        self.button_add = Button(master, text="+", padx=39, pady=20, command=self.button_add)
        self.button_subtract = Button(master, text="-", padx=41, pady=20, command=self.button_subtract)
        self.button_multiply = Button(master, text="×", padx=40, pady=20, command=self.button_multiply)
        self.button_divide = Button(master, text="÷", padx=41, pady=20, command=self.button_divide)
        self.button_integer_divide = Button(master, text="//", padx=36, pady=20, command=self.button_integer_divide)
        self.button_power = Button(master, text="^", padx=40, pady=20, command=self.button_power)
        self.button_square_root = Button(master, text="√", padx=40, pady=20, command=self.button_square_root)
        self.button_clear = Button(master, text="clear", padx=78, pady=20, command=self.button_clear)
        self.button_equal = Button(master, text="=", padx=91, pady=20, command=self.button_equal)

        # 显示按钮
        self.button_1.grid(row=3, column=0)
        self.button_2.grid(row=3, column=1)
        self.button_3.grid(row=3, column=2)

        self.button_4.grid(row=2, column=0)
        self.button_5.grid(row=2, column=1)
        self.button_6.grid(row=2, column=2)

        self.button_7.grid(row=1, column=0)
        self.button_8.grid(row=1, column=1)
        self.button_9.grid(row=1, column=2)

        self.button_0.grid(row=4, column=0)

        self.button_clear.grid(row=4, column=1, columnspan=2)
        self.button_add.grid(row=5, column=0)
        self.button_subtract.grid(row=6, column=0)
        self.button_multiply.grid(row=6, column=1)
        self.button_divide.grid(row=6, column=2)
        self.button_integer_divide.grid(row=5, column=2)
        self.button_power.grid(row=5, column=1)
        self.button_square_root.grid(row=4, column=2)
        self.button_equal.grid(row=7, column=0, columnspan=4)

    # 按钮操作
    def button_click(self, number):
        current = self.entry.get()
        self.entry.delete(0, END)
        self.entry.insert(0, str(current) + str(number))

    def button_clear(self):
        self.entry.delete(0, END)

    def button_add(self):
        first_number = self.entry.get()
        global f_num
        global math
        math = "addition"
        f_num = float(first_number)
        self.entry.delete(0, END)

    def button_subtract(self):
        first_number = self.entry.get()
        global f_num
        global math
        math = "subtraction"
        f_num = float(first_number)
        self.entry.delete(0, END)

    def button_multiply(self):
        first_number = self.entry.get()
        global f_num
        global math
        math = "multiplication"
        f_num = float(first_number)
        self.entry.delete(0, END)

    def button_divide(self):
        first_number = self.entry.get()
        global f_num
        global math
        math = "division"
        f_num = float(first_number)
        self.entry.delete(0, END)

    def button_integer_divide(self):
        first_number = self.entry.get()
        global f_num
        global math
        math = "integer_division"
        f_num = float(first_number)
        self.entry.delete(0, END)

    def button_power(self):
        first_number = self.entry.get()
        global f_num
        global math
        math = "power"
        f_num = float(first_number)
        self.entry.delete(0, END)

    def button_square_root(self):
        first_number = self.entry.get()
        self.entry.delete(0, END)
        self.entry.insert(0, sqrt(float(first_number)))

    def button_equal(self):
        second_number = self.entry.get()
        self.entry.delete(0, END)

        if math == "addition":
            self.entry.insert(0, f_num + float(second_number))
        elif math == "subtraction":
            self.entry.insert(0, f_num - float(second_number))
        elif math == "multiplication":
            self.entry.insert(0, f_num * float(second_number))
        elif math == "division":
            self.entry.insert(0, f_num / float(second_number))
        elif math == "integer_division":
            self.entry.insert(0, f_num // float(second_number))
        elif math == "power":
            self.entry.insert(0, f_num ** float(second_number))


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

运行代码后，将会看到一个简易计算器的界面。你可以按照要求，进行相应的操作。

希望这能够帮到你！