text: from tkinter import *
  from backend import Database
  
  database = Database("src/applications/book_store/books.db")
  
  
  class Window(object):
  
      def __init__(self, window):
  
          self.window = window
  
          self.window.wm_title("BookStore")
  
          l1 = Label(window, text="Title")
          l1.grid(row=0, column=0)
  
          l2 = Label(window, text="Author")
          l2.grid(row=0, column=2)
  
          l3 = Label(window, text="Year")
          l3.grid(row=1, column=0)
  
          l4 = Label(window, text="ISBN")
          l4.grid(row=1, column=2)
  
          self.title_text = StringVar()
          self.e1 = Entry(window, textvariable=self.title_text)
          self.e1.grid(row=0, column=1)
  
          self.author_text = StringVar()
          self.e2 = Entry(window, textvariable=self.author_text)
          self.e2.grid(row=0, column=3)
  
          self.year_text = StringVar()
          self.e3 = Entry(window, textvariable=self.year_text)
          self.e3.grid(row=1, column=1)
  
          self.isbn_text = StringVar()
          self.e4 = Entry(window, textvariable=self.isbn_text)
          self.e4.grid(row=1, column=3)
  
          self.list1 = Listbox(window, height=6, width=35)
          self.list1.grid(row=2, column=0, rowspan=6, columnspan=2)
  
          sb1 = Scrollbar(window)
          sb1.grid(row=2, column=2, rowspan=6)
  
          self.list1.configure(yscrollcommand=sb1.set)
          sb1.configure(command=self.list1.yview)
  
          self.list1.bind('<<ListboxSelect>>', self.get_selected_row)
  
          b1 = Button(window, text="View all", width=12,
                      command=self.view_command)
          b1.grid(row=2, column=3)
  
          b2 = Button(window, text="Search entry",
                      width=12, command=self.search_command)
          b2.grid(row=3, column=3)
  
          b3 = Button(window, text="Add entry",
                      width=12, command=self.add_command)
          b3.grid(row=4, column=3)
  
          b4 = Button(window, text="Update selected",
                      width=12, command=self.update_command)
          b4.grid(row=5, column=3)
  
          b5 = Button(window, text="Delete selected",
                      width=12, command=self.delete_command)
          b5.grid(row=6, column=3)
  
          b6 = Button(window, text="Close", width=12, command=window.destroy)
          b6.grid(row=7, column=3)
  
      def get_selected_row(self, event):
          index = self.list1.curselection()[0]
          self.selected_tuple = self.list1.get(index)
          self.e1.delete(0, END)
          self.e1.insert(END, self.selected_tuple[1])
          self.e2.delete(0, END)
          self.e2.insert(END, self.selected_tuple[2])
          self.e3.delete(0, END)
          self.e3.insert(END, self.selected_tuple[3])
          self.e4.delete(0, END)
          self.e4.insert(END, self.selected_tuple[4])
  
      def view_command(self):
          self.list1.delete(0, END)
          for row in database.view():
              self.list1.insert(END, row)
  
      def search_command(self):
          self.list1.delete(0, END)
          for row in database.search(self.title_text.get(), self.author_text.get(), self.year_text.get(), self.isbn_text.get()):
              self.list1.insert(END, row)
  
      def add_command(self):
          database.insert(self.title_text.get(), self.author_text.get(),
                          self.year_text.get(), self.isbn_text.get())
          self.list1.delete(0, END)
          self.list1.insert(END, (self.title_text.get(), self.author_text.get(
          ), self.year_text.get(), self.isbn_text.get()))
  
      def delete_command(self):
          database.delete(self.selected_tuple[0])
  
      def update_command(self):
          database.update(self.selected_tuple[0], self.title_text.get(
          ), self.author_text.get(), self.year_text.get(), self.isbn_text.get())
  
  
  window = Tk()
  Window(window)
  window.mainloop()
  