text: from tkinter import *
  import backend
  
  
  def view_command():
      list1.delete(0, END)
      for row in backend.view():
          list1.insert(END, row)
  
  
  def search_command():
      list1.delete(0, END)
      for row in backend.search(title_text.get(), author_text.get(), year_text.get(), isbn_text.get()):
          list1.insert(END, row)
  
  
  def add_command():
      backend.insert(title_text.get(), author_text.get(),
                     year_text.get(), isbn_text.get())
      list1.delete(0, END)
      list1.insert(END, (title_text.get(), author_text.get(),
                         year_text.get(), isbn_text.get()))
  
  
  def get_selected_row(event):
      try:
          global selected_tuple
          index = list1.curselection()[0]
          selected_tuple = list1.get(index)
          e1.delete(0, END)
          e1.insert(END, selected_tuple[1])
          e2.delete(0, END)
          e2.insert(END, selected_tuple[2])
          e3.delete(0, END)
          e3.insert(END, selected_tuple[3])
          e4.delete(0, END)
          e4.insert(END, selected_tuple[4])
      except IndexError:
          pass
  
  
  def delete_command():
      backend.delete(selected_tuple[0])
  
  
  def update_command():
      backend.update(selected_tuple[0], title_text.get(
      ), author_text.get(), year_text.get(), isbn_text.get())
  
  
  window = Tk()
  window.wm_title("Book Store")
  
  l1 = Label(window, text="Title")
  l1.grid(row=0, column=0)
  
  l1 = Label(window, text="Author")
  l1.grid(row=0, column=2)
  
  l1 = Label(window, text="Year")
  l1.grid(row=1, column=0)
  
  l1 = Label(window, text="ISBN")
  l1.grid(row=1, column=2)
  
  title_text = StringVar()
  e1 = Entry(window, textvariable=title_text)
  e1.grid(row=0, column=1)
  
  author_text = StringVar()
  e2 = Entry(window, textvariable=author_text)
  e2.grid(row=0, column=3)
  
  year_text = StringVar()
  e3 = Entry(window, textvariable=year_text)
  e3.grid(row=1, column=1)
  
  isbn_text = StringVar()
  e4 = Entry(window, textvariable=isbn_text)
  e4.grid(row=1, column=3)
  
  # Listbox
  
  list1 = Listbox(window, height=6, width=35)
  list1.grid(row=2, column=0, rowspan=6, columnspan=2)
  
  # scrollbarr
  sb1 = Scrollbar(window)
  sb1.grid(row=2, column=2, rowspan=6)
  
  # list box configure
  list1.configure(yscrollcommand=sb1.set)
  sb1.configure(command=list1.yview)
  
  # list box bind
  list1.bind('<<ListboxSelect>>', get_selected_row)
  
  
  b1 = Button(window, text="View All", width=12, command=view_command)
  b1.grid(row=2, column=3)
  
  b2 = Button(window, text="Search Entry", width=12, command=search_command)
  b2.grid(row=3, column=3)
  
  b3 = Button(window, text="Add Entry", width=12, command=add_command)
  b3.grid(row=4, column=3)
  
  b4 = Button(window, text="Update", width=12, command=update_command)
  b4.grid(row=5, column=3)
  
  b5 = Button(window, text="Delete", width=12, command=delete_command)
  b5.grid(row=6, column=3)
  
  b6 = Button(window, text="Close", width=12, command=window.destroy)
  b6.grid(row=7, column=3)
  
  
  window.mainloop()
  