我如何使Bind和Command在tkinter中执行相同的操作? [英] How do I make Bind and Command do the same thing in tkinter?

问题描述

我有一个带有输入字段和验证按钮的tkinter GUI.当我按条目中的一个键或单击按钮时，我想调用相同的功能.

I have a tkinter GUI with an entry field and a validation button. I'd like to call the same function when I press a key in the entry, or when I click the button.

问题是，使用条目上的bind方法，我需要一个"self"参数来使函数正常工作，而不是使用按钮.

The problem is, with the bind method on the entry, I need a "self" argument for my function to work, but not with the button.

这是简化的代码:

from tkinter import *
import tkinter.messagebox
import tkinter.filedialog


def function():
    print("Here are some words.")

my_window = Tk()

text = StringVar()
input_widget = Entry(my_window, textvariable = text) #We create an input widget.
input_widget.bind("<Return>", function)

benjamin = Button(my_window, text ='Print', command = function) #We create another widget, a 
# button that sends the same function as pressing <Return> key.

input_widget.grid(row = 0, column = 0) #We use grid to place our widgets.
benjamin.grid(row = 0, column = 1)


my_window.mainloop()

使用此代码，当我使用按钮时，没问题，它会打印，但是当我使用绑定时，它会返回:

With this code, when I use the button, no problem, it prints, but when I use the bind, it returns:

Exception in Tkinter callback
Traceback (most recent call last):
File "C:\"blablabla"\tkinter\__init__.py, line 1533, in __call__
    return self.func(*args)
TypeError: function() takes 0 positionnal arguments but 1 was given

我可以通过调用两个函数来使其工作，其中一个函数用于按钮，另一个函数用于带有自变量的条目:

I can make it work by calling two functions one for the button, and another for the entry with a self argument:

def function2(self):
    print("It works with this function.")

有什么办法可以使.bind和command共享相同的功能?

Is there any way to make both .bind and command share the the same function?

推荐答案

将此添加到您的绑定中:

Add this to your binding:

input_widget.bind("<Return>", lambda event: function())

事件绑定都需要一个事件参数，该参数将自动传递给函数.通过将lambda与参数event配合使用；您可以使用此事件"变量，基本上将其丢弃，然后执行function()

Event bindings all require an event parameter which is automatically passed to the function. By using a lambda with the parameter event; you can take in this "event" variable and basically discard it and do whatever is in function()

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