如何将 tkinter Entry 值传递给 Python 中的函数？

Question

I want to pass the values in a tkinter Entry box to a function without using a button. How can I so this?

I've tried just binding the Entry field but what is passed is not the entry but a KeyPress Event

import tkinter


def print_entry(entry):
    print(entry)

root = tkinter.Tk()
entry_field = tkinter.Entry(root)
entry_field.pack()
entry_field.bind("<Return>", print_entry)
entry_field.focus()
root.mainloop()

I expect to get the values entered in the Entry box but instead get:

<KeyPress event state=Mod1 keysym=Return keycode=13 char='\r' x=966 y=186>

Answer 1

I figured out a solution:

import tkinter


def print_entry(entry):
    print(entry)


root = tkinter.Tk()
entry_field = tkinter.Entry(root)
entry_field.pack()
entry_field.bind("<Return>", lambda x: print_entry(entry_field.get()))
entry_field.focus()
root.mainloop()

Answer 2

When you bind a function, the function will be passed an argument which represents the event. One of the attributes of that argument is widget , which represents the widget that received the event.

The most common solution is to not pass values into callbacks. Instead, have the callbacks retrieve the information that they need using this object:

def print_entry(event):
    print(event.widget.get())