技術標籤：pythontkinter

from tkinter import *

root = Tk()

frame = Frame(root)
frame.pack(padx=10, pady=10)

v1 = StringVar()
v2 = StringVar()
v3 = StringVar()

def test(content):
    if content.isdigit():
        return True
    else:
        return False

testCMD = root.register(test)
Entry(frame, textvariable=
 
v1, width=10, validate="key",\
      validatecommand=(testCMD, '%P')).grid(row=0, column=0)

Label(frame, text="+").grid(row=0, column=1)

Entry(frame, textvariable=v2, width=10, validate="key",\
      validatecommand=(testCMD, '%P')).grid(row=0, column=2)

Label(frame,text="="
 
).grid(row=0, column=3)

Entry(frame, textvariable=v3, width=10, validate="key",\
      validatecommand=(testCMD, '%P')).grid(row=0, column=4)

def calc():
    result = int(v1.get()) + int(v2.get())
    v3.set(result)

Button(frame, text="計算結果", command=calc).grid(row=1,column=2,pady=
 
5)

mainloop()

結果如下：