问带有<Key>绑定的Tkinter中的入口Widget

EN

import tkinter
from tkinter import *

class UI():
    def __init__(self, master):
        self.typed_string = StringVar()
        self.typed_string.set("")

        self.new_entry = tkinter.Entry(master, textvariable=self.typed_string)
        self.new_entry.pack()
        self.new_entry.bind("<Key>",self.check_string)

    def check_string(self, event):
        retrieved_string = self.typed_string.get()
        print(retrieved_string, " was retrieved string")
        print(self.new_entry.get(), " was get for entry widget")

def main():
    root = Tk()
    new_ui = UI(root)
    root.mainloop()

if __name__ == '__main__':
    main()