1 #tkinter应用案例：设计一个简单计算器界面功能
 2 from tkinter import *
 3 import tkinter as tk
 4  
 5 master = Tk()
 6 master.title("Jason niu工作室")
 7 theLabel=tk.Label(master,text="进入GUI世界，请开始你的表演！\n(前两个框若输入的是数字就返回true,否则就智能清除内容)")  
 8 theLabel.pack() 
 9  
10 frame = Frame(master)  
11 frame.pack(padx=10,pady=10) 
12  
13 v1 = StringVar()  
14 v2 = StringVar()
15 v3 = StringVar()
16  
17 def test(content):  
18     return content.isdigit()    
19  
20 testCMD = master.register(test)
21  
22 e1 = Entry(frame,textvariable=v1,validate="key",validatecommand=(testCMD,"%P")).grid(row=0,column=0)
23 Label(frame,text="+").grid(row=0,column=1)  
24 e2 = Entry(frame,textvariable=v2,validate="key",validatecommand=(testCMD,"%P")).grid(row=0,column=2)
25 Label(frame,text="=").grid(row=0,column=3) 
26 e3 = Entry(frame,textvariable=v3,state="readonly").grid(row=0,column=4)  
27  
28 def calc(): 
29     result = int(v1.get())+int(v2.get())  
30     v3.set(str(result))
31     
32 Button(frame,text="计算结果",command=calc).grid(row=1,column=2,pady=5)  
33  
34 mainloop()