To_do_app.py

import tkinter as tk
from tkinter import messagebox

class TodoListApp:
    def __init__(self, root):
        self.root = root
        self.root.title("TO-DO LIST")
        self.root.geometry("500x400")
        self.root.config(bg="#A0E7E5")  
        self.tasks = []

        self.task_entry = tk.Entry(root, width=30, font=('Arial', 14))
        self.task_entry.grid(row=0, column=0, padx=10, pady=10)

        add_button = tk.Button(root, text="Add Task", command=self.add_task, font=('Arial', 12), bg="#B4F8C8", fg="black")  # Set button colors
        add_button.grid(row=0, column=1, padx=10, pady=10)

        self.task_listbox = tk.Listbox(root, width=40, height=10, font=('Arial', 12), bg="#ecf0f1", fg="black", selectbackground="#189ab4")  # Set listbox colors
        self.task_listbox.grid(row=1, column=0, columnspan=2, padx=10, pady=10)

        remove_button = tk.Button(root, text="Remove Task", command=self.remove_task, font=('Arial', 12), bg="#e8b4b8", fg="black")  # Set button colors
        remove_button.grid(row=2, column=0, padx=10, pady=10, sticky="ew")

        complete_button = tk.Button(root, text="Complete Task", command=self.complete_task, font=('Arial', 12), bg="#e8b4b8", fg="black")  # Set button colors
        complete_button.grid(row=2, column=1, padx=10, pady=10, sticky="ew")

        self.task_listbox.bind('<Double-Button-1>', lambda event: self.complete_task())

    def add_task(self):
        task = self.task_entry.get()
        if task:
            self.tasks.append(task)
            self.update_task_list()
            self.task_entry.delete(0, tk.END)
        else:
            messagebox.showwarning("Warning", "Please enter a task.")

    def remove_task(self):
        selected_task_index = self.task_listbox.curselection()
        if selected_task_index:
            self.tasks.pop(selected_task_index[0])
            self.update_task_list()

    def complete_task(self):
        selected_task_index = self.task_listbox.curselection()
        if selected_task_index:
            completed_task = self.tasks.pop(selected_task_index[0])
            completed_task = f"[Done] {completed_task}"
            self.tasks.append(completed_task)
            self.update_task_list()

    def update_task_list(self):
        self.task_listbox.delete(0, tk.END)
        for task in self.tasks:
            self.task_listbox.insert(tk.END, task)

if __name__ == "__main__":
    root = tk.Tk()
    app = TodoListApp(root)
    root.mainloop()