[Python] im new to python and need some help trying to get the button to start/stop the loop

ive been trying stuff and nothing is working im trying to get the button to start/stop the mining loop but it either starts after closing the program or doesnt do anything at all

import hashlib
import time
from tkinter import *
import tkinter as tk

i = 1
root = tk.Tk()
# root window title and dimension
root.title("Bitcoin miner")
# Set geometry (widthxheight)
root.geometry('200x100')
def toggle():

if toggle_btn.config('relief')[-1] == 'sunken':
toggle_btn.config(relief="raised", text="Off")
i == 2
else:
toggle_btn.config(relief="sunken", text="On")
i == 1
v = IntVar()

toggle_btn = tk.Button(text="Off", width=12, relief="raised", command=toggle)
toggle_btn.pack(pady=5)

toggle_btn.place(x=55, y=50)
root.mainloop()

def mine(block_string, difficulty):
nonce = 0
prefix_str = '0'*difficulty
while True:
text = block_string + str(nonce)
new_hash = hashlib.sha256(text.encode('ascii')).hexdigest()
if new_hash.startswith(prefix_str):
print("Yay! Bitcoin mined in nonce: %s with hash: %s" % (nonce, new_hash))
return new_hash
nonce += 1

if __name__ == '__main__':

while i == 1:
block_string = "Some transactions"
difficulty = 5
start = time.time()
print("Start mining")
new_hash = mine(block_string, difficulty)
total_time = str((time.time() - start))
print("end mining. Mining took: " + total_time + " seconds.")


i tried putting the loop beneath and above things and it doesnt help

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