1. 简易计算器，窗口界面自由发挥，编程实现两个整数的**加**、**减**、**乘**、**除**操作。要求如下: - 首先进行操作数文本框检验，检验输入数据是否为**纯数字**； - 通过分别单击加、减、乘、除按钮，对操作数1与操作数2进行相应加、减、乘、除操作，并且将其结果写入操作3文本框。

好的，这是一个简单的计算器程序，可以使用Python的tkinter库来创建窗口界面，并编写相应的代码实现加、减、乘、除操作。下面是一个示例代码：

import tkinter as tk

class Calculator:
    def __init__(self, master):
        self.master = master
        master.title("Calculator")
        
        self.label1 = tk.Label(master, text="Operand 1:")
        self.label1.grid(row=0, column=0)
        
        self.entry1 = tk.Entry(master)
        self.entry1.grid(row=0, column=1)
        
        self.label2 = tk.Label(master, text="Operand 2:")
        self.label2.grid(row=1, column=0)
        
        self.entry2 = tk.Entry(master)
        self.entry2.grid(row=1, column=1)
        
        self.label3 = tk.Label(master, text="Result:")
        self.label3.grid(row=2, column=0)
        
        self.entry3 = tk.Entry(master, state="readonly")
        self.entry3.grid(row=2, column=1)
        
        self.add_button = tk.Button(master, text="+", command=self.add)
        self.add_button.grid(row=3, column=0)
        
        self.subtract_button = tk.Button(master, text="-", command=self.subtract)
        self.subtract_button.grid(row=3, column=1)
        
        self.multiply_button = tk.Button(master, text="*", command=self.multiply)
        self.multiply_button.grid(row=4, column=0)
        
        self.divide_button = tk.Button(master, text="/", command=self.divide)
        self.divide_button.grid(row=4, column=1)
        
    def add(self):
        operand1 = self.entry1.get()
        operand2 = self.entry2.get()
        if operand1.isdigit() and operand2.isdigit():
            result = int(operand1) + int(operand2)
            self.entry3.configure(state="normal")
            self.entry3.delete(0, tk.END)
            self.entry3.insert(0, str(result))
            self.entry3.configure(state="readonly")
            
    def subtract(self):
        operand1 = self.entry1.get()
        operand2 = self.entry2.get()
        if operand1.isdigit() and operand2.isdigit():
            result = int(operand1) - int(operand2)
            self.entry3.configure(state="normal")
            self.entry3.delete(0, tk.END)
            self.entry3.insert(0, str(result))
            self.entry3.configure(state="readonly")
            
    def multiply(self):
        operand1 = self.entry1.get()
        operand2 = self.entry2.get()
        if operand1.isdigit() and operand2.isdigit():
            result = int(operand1) * int(operand2)
            self.entry3.configure(state="normal")
            self.entry3.delete(0, tk.END)
            self.entry3.insert(0, str(result))
            self.entry3.configure(state="readonly")
            
    def divide(self):
        operand1 = self.entry1.get()
        operand2 = self.entry2.get()
        if operand1.isdigit() and operand2.isdigit() and int(operand2) != 0:
            result = int(operand1) / int(operand2)
            self.entry3.configure(state="normal")
            self.entry3.delete(0, tk.END)
            self.entry3.insert(0, str(result))
            self.entry3.configure(state="readonly")
        

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

运行程序后，会出现一个窗口界面，其中包括两个操作数文本框和一个结果文本框，以及四个按钮用于进行加、减、乘、除操作。用户在输入操作数时，会对其进行检验，只有在输入的数据为纯数字时才能进行计算。用户单击按钮后，程序会根据用户选择的操作对操作数1和操作数2进行相应的计算，并将结果显示在结果文本框中。