text: from tkinter import *
  from tkinter import filedialog
  
  # nastojki okna
  window = Tk()
  window.geometry('300x600')
  window.title('Spisok del')
  window.maxsize(300, 600)
  window.minsize(300, 600)
  window.config(bg='#c2ffea')
  
  numeration = 0
  
  def save():
      text = todolist.get(0.0, END)
      file = filedialog.asksaveasfile(
          title='Save file',
          filetypes=(('txt files', '*.txt'), ('all files', '*.*')))
      if file:
          file.write(text)
  
  
  def load():
      todolist.delete(0.0, END)
      file = filedialog.askopenfile(title='Select file',
                                    filetypes=(('txt '
                                    'files', '*.txt'), ('all files', '*.*')))
      text = file.read()
      todolist.insert(END, text)
  
  
  def delete_f():
      global numeration
      todolist.delete(0.0, END)
      numeration = 0
  
  
  def clear(what_l, when_l):
      what_l.delete(0, END)
      when_l.delete(0, END)
  
  
  def add():
      global numeration
      numeration += 1
      text = str(numeration) + '.' + what.get() + "\t" + when.get()+'\n'
      todolist.insert(END, text)
      clear(what, when)
  
  
  frame = LabelFrame(text='Записать важное дело', width=300, height=150,
                     bg='pale turquoise')
  frame.pack(pady=5, padx=10)
  
  
  label1 = Label(frame, text='Какое дело?', relief=GROOVE, border=3,  fg='black',
                 bg='bisque')
  label1.grid(pady=5, padx=10, column=0, row=0)
  
  what = Entry(frame, bg='white', fg='black', font='Arial8',
               justify=CENTER, relief=RAISED, width=9, state=NORMAL)
  what.grid(column=0, row=1, pady=10, padx=10)
  
  label2 = Label(frame, text='Когда?', relief=GROOVE, border=3,  fg='black',
                 bg='PeachPuff2')
  label2.grid(pady=5, padx=10, column=1, row=0)
  
  when = Entry(frame, bg='white', fg='black', font='Arial8',
               justify=CENTER, relief=RAISED, width=9, state=NORMAL)
  when.grid(pady=10, padx=10, column=1, row=1)
  
  
  todolist = Text(width=30, height=18)
  todolist.pack()
  
  
  addbutton = Button(frame, text='Добавить важное дело', command=add,
                     relief=GROOVE, border=3, bg='LightSteelBlue1')
  addbutton.grid(pady=10, padx=10, column=0, row=2, columnspan=2)
  
  
  deleteb = Button(text='Удалить все', command=delete_f,
                   relief=RAISED,
                   border=5, bg='VioletRed1')
  deleteb.pack(pady=10, padx=10)
  
  saveb = Button(text='Save', command=save, relief=RAISED, border=5, bg='medium spring green')
  saveb.pack(pady=10, padx=10)
  
  loadb = Button(text='Load', command=load, relief=RAISED, border=5, bg='plum1')
  loadb.pack(pady=10, padx=10)
  
  
  window.mainloop()
  