python_mini_projects/todo_list.py at main · sandanasundar/python_mini_projects · GitHub

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import tkinter as tk
from tkinter import messagebox

FILE_NAME = "tasks.txt"

# --- FILE LOGIC ---
def load_tasks():
    try:
        file = open(FILE_NAME, "r")
        tasks = file.read().splitlines()
        file.close()
        return tasks
    except FileNotFoundError:
        return []

def save_tasks(tasks):
    file = open(FILE_NAME, "w")
    for task in tasks:
        file.write(task + "\n")
    file.close()

# --- GUI ---
tasks = load_tasks()

def refresh_tasks():
    listbox.delete(0, tk.END)
    for i, task in enumerate(tasks, start=1):
        listbox.insert(tk.END, f"{i}. {task}")

def add_task():
    task = entry.get().strip()
    if task == "":
        messagebox.showwarning("Warning", "Task cannot be empty")
        return
    tasks.append(task)
    save_tasks(tasks)
    entry.delete(0, tk.END)
    refresh_tasks()

def delete_task():
    try:
        index = listbox.curselection()[0]
        tasks.pop(index)
        save_tasks(tasks)
        refresh_tasks()
    except IndexError:
        messagebox.showwarning("Warning", "Please select a task to delete")

def update_task():
    try:
        index = listbox.curselection()[0]
        new_task = entry.get().strip()
        if new_task == "":
            messagebox.showwarning("Warning", "Task cannot be empty")
            return
        tasks[index] = new_task
        save_tasks(tasks)
        entry.delete(0, tk.END)
        refresh_tasks()
    except IndexError:
        messagebox.showwarning("Warning", "Please select a task to update")

# --- WINDOW ---
root = tk.Tk()
root.title("To-Do List")
root.geometry("400x500")
root.configure(bg="#f4f6f8")
root.resizable(False, False)

# --- TITLE ---
title = tk.Label(
    root,
    text="To-Do List",
    font=("Arial", 18, "bold"),
    bg="#f4f6f8",
    fg="#2c3e50"
)
title.pack(pady=15)

# ---INPUT ---
entry = tk.Entry(
    root,
    width=30,
    font=("Arial", 12),
    bg="#ffffff",
    fg="#000000",
    relief="solid"
)
entry.pack(pady=10)

# --- BUTTONS ---
btn_frame = tk.Frame(root, bg="#f4f6f8")
btn_frame.pack(pady=10)

add_btn = tk.Button(
    btn_frame,
    text="Add Task",
    width=12,
    bg="#2ecc71",
    fg="white",
    font=("Arial", 10, "bold"),
    command=add_task
)
add_btn.grid(row=0, column=0, padx=10)

delete_btn = tk.Button(
    btn_frame,
    text="Delete Task",
    width=12,
    bg="#e74c3c",
    fg="white",
    font=("Arial", 10, "bold"),
    command=delete_task
)
delete_btn.grid(row=0, column=1, padx=10)

ubt_btn = tk.Button(
    btn_frame,
    text="Update Task",
    width=12,
    bg="#3498db",
    fg="white",
    font=("Arial", 10, "bold"),
    command=update_task
)
ubt_btn.grid(row=0, column=2, padx=10)


# --- TASK LIST ---
listbox = tk.Listbox(
    root,
    width=40,
    height=15,
    font=("Arial", 11),
    bg="#ffffff",
    fg="#34495e",
    selectbackground="#0b68a6",
    relief="solid"
)
listbox.pack(pady=15)

refresh_tasks()
root.mainloop()