todolist_py

import tkinter as tk
from tkinter import *

class ToDo:
    def _init_(self, root):
        self.root = root
        self.root.title('To-do List')
        self.root.geometry('650x450+300+150')

        self.label = Label(self.root, text='To-Do List App',
                           font='Arial, 25 bold', width=20, bd=5, bg='orange', fg='black')
        self.label.pack(side='top', fill=BOTH)

        #Label is used to create simple labels or text which have no functionality 
        self.label2 = Label(self.root, text='Add Task ',
                            font='Arial, 18 bold', width=10, bd=5, bg='orange', fg='black')
        self.label2.place(x=40, y=54)

        self.label3 = Label(self.root, text='Tasks',
                            font='Arial, 18 bold', width=10, bd=5, bg='orange', fg='black')
        self.label3.place(x=320, y=54)

        #Listbox is used to create a OuterBox to take input from user 
        self.main_text = Listbox(self.root, height=9, bd=5, width=23,
                                 font="Arial, 20 italic bold")
        self.main_text.place(x=280, y=100)

        #Text is used to take input from user
        self.text = Text(self.root, font='Arial, 10 bold', width=30, height=4, bd=5)
        self.text.place(x=10, y=120)

        self.load_tasks()
        #Button is used to create a button having specific functionality like add or delete
        self.button = Button(self.root, text="Add", font='Arial, 20 bold italic', width=10, bd=5, bg='orange', fg='black', command=self.add)
        self.button.place(x=30, y=200)

        self.button2 = Button(self.root, text="Delete", font='Arial, 20 bold italic', width=10, bd=5, bg='orange', fg='black', command=self.delete)
        self.button2.place(x=30, y=280)

    # def is used to define a function to obtain the functionality of the buttons
    def load_tasks(self):
        with open('data.txt', 'r') as file:
            read = file.readlines()
            for i in read:
                ready = i.strip()
                self.main_text.insert(END, ready)

    def add(self):
        content = self.text.get(1.0, END)
        self.main_text.insert(END, content)
        with open('data.txt', 'a') as file:
            file.write(content)
        self.text.delete(1.0, END)

    def delete(self):
        delete_ = self.main_text.curselection()
        look = self.main_text.get(delete_)
        with open('data.txt', 'r+') as f:
            new_f = f.readlines()
            f.seek(0)
            for line in new_f:
                item = str(look)
                if item not in line:
                    f.write(line)
            f.truncate()
        self.main_text.delete(delete_)

def main():
    root = tk.Tk()
    ui = ToDo(root)
    root.mainloop()

if _name_ == '_main_':
    main()