python获取当前界面控件 python获取entry框内容

from tkinter import *
import tkinter as tk
def get():
    print("获取到的内容是 \033[91m%s" % entry.get())

root=tk.Tk()
root.title('获取Entry内容')
root.geometry('200x100')

frame = Frame(root)
frame.pack()
u1 = tk.StringVar()
entry = tk.Entry(frame, width=20, textvariable=u1,  relief="sunken")
entry.pack(side="left")

frame1 = Frame(root)
frame1.pack()
btn1=Button(frame1, text="获取", width=20, height=1, relief=GROOVE, command=lambda :get())
btn1.pack(side="left")

root.mainloop()