Stopwatch App GUI

import tkinter as tk
import time

# Initialize the window
window = tk.Tk()
window.title("Stopwatch")

# Stopwatch variables
start_time = 0
elapsed_time = 0
is_running = False

# Label to display the stopwatch time
time_label = tk.Label(window, text="00:00:00", font=("Helvetica", 48))
time_label.pack(pady=10)

# Function to start the stopwatch
def start_stopwatch():
    global start_time, is_running

    if not is_running:
        is_running = True
        start_time = time.time()
        update_stopwatch()

# Function to stop the stopwatch
def stop_stopwatch():
    global is_running

    if is_running:
        is_running = False

# Function to reset the stopwatch
def reset_stopwatch():
    global elapsed_time, is_running

    elapsed_time = 0
    is_running = False
    time_label.config(text="00:00:00")

# Function to update the stopwatch time
def update_stopwatch():
    global elapsed_time

    if is_running:
        elapsed_time = time.time() - start_time

    minutes = int(elapsed_time // 60)
    seconds = int(elapsed_time % 60)
    milliseconds = int((elapsed_time % 1) * 100)

    time_string = f"{minutes:02d}:{seconds:02d}:{milliseconds:02d}"
    time_label.config(text=time_string)

    window.after(10, update_stopwatch)

# Create buttons for stopwatch control
start_button = tk.Button(window, text="Start", command=start_stopwatch)
start_button.pack(side=tk.LEFT, padx=5)

stop_button = tk.Button(window, text="Stop", command=stop_stopwatch)
stop_button.pack(side=tk.LEFT, padx=5)

reset_button = tk.Button(window, text="Reset", command=reset_stopwatch)
reset_button.pack(side=tk.LEFT, padx=5)

window.mainloop()