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import tkinter as tk
from tkinter import messagebox

# Main application class
class TodoApp:
    def __init__(self, root):
        self.root = root
        self.root.title("Simple To-Do List")
        self.root.geometry("400x400")

        self.tasks = []  # List to hold tasks

        # Create UI components
        self.create_widgets()

    def create_widgets(self):
        # Entry widget for new task
        self.task_entry = tk.Entry(self.root, width=30)
        self.task_entry.pack(pady=10)

        # Button to add task
        self.add_button = tk.Button(self.root, text="Add Task", width=20, command=self.add_task)
        self.add_button.pack(pady=10)

        # Listbox to display tasks
        self.task_listbox = tk.Listbox(self.root, width=50, height=10)
        self.task_listbox.pack(pady=10)

        # Button to delete task
        self.delete_button = tk.Button(self.root, text="Delete Task", width=20, command=self.delete_task)
        self.delete_button.pack(pady=10)

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

    def delete_task(self):
        try:
            selected_task_index = self.task_listbox.curselection()[0]
            self.tasks.pop(selected_task_index)
            self.update_task_listbox()
        except IndexError:
            messagebox.showwarning("Selection Error", "Please select a task to delete.")

    def update_task_listbox(self):
        # Clear the current list in the Listbox
        self.task_listbox.delete(0, tk.END)

        # Populate Listbox with tasks
        for task in self.tasks:
            self.task_listbox.insert(tk.END, task)

# Create the main window
root = tk.Tk()

# Initialize the To-Do app
app = TodoApp(root)

# Start the Tkinter event loop
root.mainloop()