tkinter.TclError：剪贴板选择不存在或未定义表格“ STRING”

Question

下面的脚本是如果我复制这样的链接：http://urlshortener.io/s/1234rIHs/?s=https%3A%2F%2Fexample.com%2Fsome_content%2F，如果单击该按钮，它将更改为example.com/some_content/。

from tkinter import *
from urllib import parse
from tkinter import Tk


root = Tk()
root.title("Slicer")

root.geometry('304x70')

lbl = Label(root, text="Link")
lbl.pack()



def clicked():
    clip = root.clipboard_get()
    clip = parse.unquote(clip)[45:]

    root.clipboard_clear()
    root.clipboard_append(clip)
    lbl.configure(text= clip)

btn = Button(root, text="Slice", command=clicked, height = 3, width = 40)
btn.pack()


root.mainloop()

我正在尝试使此脚本在后台运行并侦听“复制”操作，然后，如果我在浏览器中复制了一些文本，它将自动对我刚刚复制的文本进行切片，而我不需要点击按钮。

我看到了布莱恩·奥克利（Bryan Oakley）在这个问题上的回答https://codereview.stackexchange.com/questions/184570/clipboard-detector-in-pythons

现在我尝试将他的代码与我的代码一起使用

from tkinter import *
from urllib import parse
from tkinter import Tk

root = Tk()
root.title("Slicer")

root.geometry('304x70')

lbl = Label(root, text="Link")
lbl.pack()


def check_clipboard(window):
    clip = root.clipboard_get()
    clip = parse.unquote(clip)[45:]

    root.clipboard_clear()
    root.clipboard_append(clip)
    lbl.configure(text= clip)


def run_listener(window, interval):
    check_clipboard(window)
    root.after(interval, run_listener, window, interval)

run_listener(root, 500)

root.mainloop()

但是我遇到了错误：

Traceback (most recent call last):
  File "C:\Users\leka.12\Desktop\lister.py", line 28, in <module>
    run_listener(root, 500)
  File "C:\Users\leka.12\Desktop\lister.py", line 25, in run_listener
    check_clipboard(window)
  File "C:\Users\leka.12\Desktop\lister.py", line 16, in check_clipboard
    clip = root.clipboard_get()
  File "C:\Users\leka.12\AppData\Local\Programs\Python\Python37\lib\tkinter\__init__.py", line 804, in clipboard_get
    return self.tk.call(('clipboard', 'get') + self._options(kw))
_tkinter.TclError: CLIPBOARD selection doesn't exist or form "STRING" not defined
>>> 

我也发现了这个tkinter error when copying contents from clipboard in Python

但这与我的脚本无关：

try:
    selection = r.selection.get(selection="CLIPBOARD")
except tk.TclError:
    selection = None