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The two goals of my program: #1 copy notes to the clipboard after clicking a button; and #2 make the button widgets persist through restart of the program. (This post will focus solely on goal number 1) The buttons are populated as expected, but the command does not work properly (No Errors though). I've tried other clipboard modules such as pyperclip with no luck. Apologies if this was hard to follow, I just started to learn python as my first programming language last week.

I would like to know how I would go about making the buttons copy their corresponding notes to the clipboard.

from tkinter import *
import json

root = Tk()
root.title("CopyNotes")
root.geometry()

json_file = open("dictionary.json", encoding="utf-8")
mynotes = json.load(json_file)

for keys in mynotes:
 btnz = Button(root, text=mynotes[keys][0], font="Helvetica 10 bold", bg="silver", command=root.clipboard_append(mynotes[keys][1]), height=2, width=13).pack(side=TOP, fill=BOTH, expand=YES)

root.mainloop()

So just to be clear, the issue I'm trying to solve is the button command not working properly. First time any buttons are pressed it copies 'button1notebutton2notebutton3note'and stops working at all after that.
The effect I want the first button to achieve: root.clipboard_append(button1note)
and so on for the rest..

After I figure out how to do this, I plan on accepting user input to add their own buttons by adding to the dictionary.
Edit: Fixed the clipboard issue -

 mynotes = pickle.load(open("note.p", "rb"))
 print(mynotes)
 for keys in mynotes:
 thenotes = mynotes[keys][1]
 mybtnz = Button(ctowin, text=mynotes[keys][0], font="Helvetica 10 bold", bg="silver",
 command=lambda thenotes=thenotes: pyperclip.copy(thenotes), height=2, width=13)
 .pack(side=TOP, fill=BOTH, expand=YES)

Button example

You don't need to use json as you are not working with a JSON object but a python dictionary.

Here is your code refactored to populate the app with 3 buttons;

[UPDATED] Although you will need to completely refactor your code because your for loop is populating the clipboard with everything in your dictionary immediately.

from tkinter import *
from tinydb import TinyDB, Query

db = TinyDB('clipboard.json')

root = Tk()
root.title("CopyNotes")
root.geometry()

mynotes = 
 "B1": ["button1label","button1note"], 
 "B2":["button2label","button2note"], 
 "B3":["button3label","button3note"]


def cp_to_cb_and_db(note, key):
 root.clipboard_append(note[key][1])
 print('[+] Adding note: to clipboard.'.format(note))
 db.insert(key: note)


for key in mynotes:
 btnz = Button(
 root, 
 text=mynotes[key][0], 
 font="Helvetica 10 bold", 
 bg="silver", 
 command=cp_to_cb_and_db(mynotes, key), 
 height=2, 
 width=13).pack(side=TOP, fill=BOTH, expand=YES)

root.mainloop()