无法使用tkinter解除绑定功能 [英] Unable to unbind a function using tkinter

问题描述

我正在Python 3.5中使用Tkinter，但遇到一个奇怪的问题.

I am working with Tkinter in Python 3.5 and I encounter a weird problem.

我使用了 tkinterbook关于事件和绑定的方法来编写这种简单的代码例如:

I used the tkinterbook about events and bindings to write this simple example:

from tkinter import *

root = Tk()

frame = Frame(root, width=100, height=100)

def callback(event):
    print("clicked at", event.x, event.y)
    # frame.unbind("<Button-1>", callback)

frame.bind("<Button-1>", callback)
frame.pack()

root.mainloop()

它工作正常，但是如果我尝试取消绑定回调(只需取消注释该行)，它将失败并显示以下错误:

It works fine, but if I try to unbind the callback (just uncomment the line), it fails with the following error:

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\Delgan\AppData\Local\Programs\Python\Python35\lib\tkinter\__init__.py", line 1549, in __call__
    return self.func(*args)
  File "C:\Users\Delgan\Desktop\Test\test.py", line 9, in callback
    frame.unbind("<Button-1>", callback)
  File "C:\Users\Delgan\AppData\Local\Programs\Python\Python35\lib\tkinter\__init__.py", line 1105, in unbind
    self.deletecommand(funcid)
  File "C:\Users\Delgan\AppData\Local\Programs\Python\Python35\lib\tkinter\__init__.py", line 441, in deletecommand
    self.tk.deletecommand(name)
TypeError: deletecommand() argument must be str, not function

目前尚不清楚，我不确定这是tkinter中的错误还是做错了事.

This is not clear, I am not sure if it is a bug in tkinter or if I am doing something wrong.

frame.unbind("<Button-1>")正常工作，但我想删除此确切的回调而不是全局删除.

frame.unbind("<Button-1>") works fine but I would like to remove this exact callback instead of a global remove.

推荐答案

unbind的第二个参数是'funcid'，而不是函数. help(root.unbind)返回

The second argument to unbind is a 'funcid', not a function. help(root.unbind) returns

tkinter.Tk实例的

unbind(sequence, funcid=None)方法. 对此事件SEQUENCE的此小部件取消绑定，用FUNCID标识的功能.

unbind(sequence, funcid=None) method of tkinter.Tk instance. Unbind for this widget for event SEQUENCE the function identified with FUNCID.

许多tk函数返回tk对象ID，它们可以作为其他函数的参数，而bind是其中之一.

Many tk functions return tk object ids that can be arguments for other funtions, and bind is one of them.

>>> i = root.bind('<Button-1>', int)
>>> i
'1733092354312int'
>>> root.unbind('<Button-1>', i)  # Specific binding removed.

help(root.bind)的输出中包含以下内容:绑定将返回一个标识符，以允许删除绑定的函数而无需解除绑定而不会发生内存泄漏."

Buried in the output from help(root.bind) is this: "Bind will return an identifier to allow deletion of the bound function with unbind without memory leak."

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