from tkinter import *
from tkinter import messagebox

def newTask():
    task=my_entry.get()
    if task !="":
        lb.insert(END, task)
        my_entry.delete(0, "end")
    else:
        messagebox.showwarning("warning","please enter some task.")

def deleteTask():
    lb.delete(ANCHOR)

ws=Tk()
ws.geometry('500x450+500+200')
ws.title('PythonGuides')
ws.config(bg='#223441')
ws.resizable(width=True,height=True)

frame=Frame(ws)
frame.pack(pady=10)

lb=Listbox(
    frame,
    width=25,
    height=8,
    font=('Times',18),
    bd=0,
    fg='#464646',
    highlightthickness=0,
    selectbackground='#a6a6a6',
    activestyle='none',
)
lb.pack(side=LEFT,fill=BOTH)

task_list=[]
for item in task_list:
    lb.insert(END,item)

sb=Scrollbar(frame)
sb.pack(side=RIGHT,fill=BOTH)

lb.config(yscrollcommand=sb.set)
sb.config(command=lb.yview)

my_entry=Entry(
    ws,
    font=('times',24))
my_entry.pack(pady=20)

button_frame=Frame(ws)
button_frame.pack(pady=20)

addTask_btn=Button(
    button_frame,
    text='Add Task',
    font=('times', 14),
    bg='#c5f776',
    padx=20,
    pady=10,
    command=newTask)
addTask_btn.pack(fill=BOTH,expand=True, side=LEFT)

delTask_btn=Button(button_frame, text='Delete Task',
    font=('times',14),
    bg='#ff8b61',
    padx=20,
    pady=10,
    command=deleteTask)
delTask_btn.pack(fill=BOTH,expand=True,side=LEFT)

ws.mainloop()