计算器

 1 from tkinter import *
 2 
 3 master = Tk()
 4 
 5 frame = Frame(master)
 6 frame.pack(padx=10,pady=10)
 7 
 8 v1 = StringVar()
 9 v2 = StringVar()
10 v3 = StringVar()
11 def test(content):
12     return content.isdigit()
13 
14 testCMD=master.register(test)
15 
16 e1=Entry(frame,width=10,textvariable=v1,validate="key",17          validatecommand=(testCMD,‘%P‘)).grid(row=0,column=0)
18 
19 Label(frame,text="+").grid(row=0,column=1)
20 
21 e2=Entry(frame,width=10,textvariable=v2,validate="key",22          validatecommand=(testCMD,‘%P‘)).grid(row=0,column=2)
23 
24 Label(frame,text="=").grid(row=0,column=3)
25 
26 e3=Entry(frame,width=10,textvariable=v3,state="readonly").grid(row=0,column=4)
27 
28 
29 def calc():
30     result = int(v1.get()) + int(v2.get())
31     v3.set(str(result))
32 
33 Button(frame,text="计算结果",command=calc).grid(row=1,column=2,pady=5)
34 mainloop()