python 窗口中标签、文本框、按钮使用

import tkinter as tk
from tkinter import ttk
def inputData():
    b.configure(text = v.get())
    title.configure(foreground = "green")
win = tk.Tk()
v = tk.StringVar()                         # （设置
a = ttk.Entry(win,width = 12,textvariable = v)    文本框 ）
a.grid(column = 1 ,row = 0 )
b = ttk.Button(win,text = "Input",command=inputData) # 按钮
b.grid(column = 2 ,row = 0 )
title = ttk.Label(win,text = "Please input:") # 标签
title.grid(column = 0,row = 0)
win.mainloop()