问为什么gui窗口不弹出来？

EN

from tkinter import ttk
from tkinter import *

import sqlite3

            class Product:
                # connection dir property
                db_name = 'database.db'

                def __init__(self, window):
                    # Initializations
                    self.wind = window
                    self.wind.title('Products Application')

                    # Creating a Frame Container
                    frame = LabelFrame(self.wind, text = 'Register new Product')
                    frame.grid(row = 0, column = 0, columnspan = 3, pady = 20)

                    # Name Input
                    Label(frame, text = 'Name: ').grid(row = 1, column = 0)
                    self.name = Entry(frame)
                    self.name.focus()
                    self.name.grid(row = 1, column = 1)

                    # Price Input
                    Label(frame, text = 'Price: ').grid(row = 2, column = 0)
                    self.price = Entry(frame)
                    self.price.grid(row = 2, column = 1)

                    # Button Add Product
                    ttk.Button(frame, text = 'Save Product').grid(row = 3, columnspan = 2, sticky = W + E)

                    # Output Messages
                    self.message = Label(text = '', fg = 'red')
                    self.message.grid(row = 3, column = 0, columnspan = 2, sticky = W + E)

                    # Table
                    self.tree = ttk.Treeview(height = 10, columns = 2)
                    self.tree.grid(row = 4, column = 0, columnspan = 2)
                    self.tree.heading('#0', text = 'Name', anchor = CENTER)
                    self.tree.heading('#1', text = 'Price', anchor = CENTER)

                    # Buttons
                    ttk.Button(text = 'DELETE', command = self.delete_product).grid(row = 5, column = 0, sticky = W + E)
                    ttk.Button(text = 'EDIT').grid(row = 5, column = 1, sticky = W + E)

                    # Filling the Rows
                    self.get_products()

# Function to Execute Database Querys
def run_query(self, query, parameters = ()):
    with sqlite3.connect(self.db_name) as conn:
        cursor = conn.cursor()
        result = cursor.execute(query, parameters)
        conn.commit()
    return result

# Get Products from Database
def get_products(self):
    # cleaning Table
    records = self.tree.get_children()
    for element in records:
        self.tree.delete(element)
    # getting data
    query = 'SELECT * FROM product ORDER BY name DESC'
    db_rows = self.run_query(query)
    # filling data
    for row in db_rows:
        self.tree.insert('', 0, text = row[1], values = row[2])

# User Input Validation
def validation(self):
    return len(self.name.get()) != 0 and len(self.price.get()) != 0

def add_product(self):
    if self.validation():
        query = 'INSERT INTO product VALUES(NULL, ?, ?)'
        parameters =  (self.name.get(), self.price.get())
        self.run_query(query, parameters)
        self.message['text'] = 'Product {} added Successfully'.format(self.name.get())
        self.name.delete(0, END)
        self.price.delete(0, END)
    else:
        self.message['text'] = 'Name and Price is Required'
    self.get_products()

def delete_product(self):
    self.message['text'] = ''
    try:
       self.tree.item(self.tree.selection())['text'][0]
    except IndexError as e:
        self.message['text'] = 'Please select a Record'
        return
    self.message['text'] = ''
    name = self.tree.item(self.tree.selection())['text']
    query = 'DELETE FROM product WHERE name = ?'
    self.run_query(query, (name, ))
    self.message['text'] = 'Record {} deleted Successfully'.format(name)
    self.get_products()

def edit_product(self):
    self.message['text'] = ''
    try:
        self.tree.item(self.tree.selection())['values'][0]
    except IndexError as e:
        self.message['text'] = 'Please, select Record'
        return
    name = self.tree.item(self.tree.selection())['text']
    old_price = self.tree.item(self.tree.selection())['values'][0]
    self.edit_wind = Toplevel()
    self.edit_wind.title = 'Edit Product'
    # Old Name
    Label(self.edit_wind, text = 'Old Name:').grid(row = 0, column = 1)
    Entry(self.edit_wind, textvariable = StringVar(self.edit_wind, value = name), state = 'readonly').grid(row = 0, column = 2)
    # New Name
    Label(self.edit_wind, text = 'New Price:').grid(row = 1, column = 1)
    new_name = Entry(self.edit_wind)
    new_name.grid(row = 1, column = 2)

    # Old Price
    Label(self.edit_wind, text = 'Old Price:').grid(row = 2, column = 1)
    Entry(self.edit_wind, textvariable = StringVar(self.edit_wind, value = old_price), state = 'readonly').grid(row = 2, column = 2)
    # New Price
    Label(self.edit_wind, text = 'New Name:').grid(row = 3, column = 1)
    new_price= Entry(self.edit_wind)
    new_price.grid(row = 3, column = 2)

    Button(self.edit_wind, text = 'Update', command = lambda: self.edit_records(new_name.get(), name, new_price.get(), old_price)).grid(row = 4, column = 2, sticky = W)
    self.edit_wind.mainloop()

def edit_records(self, new_name, name, new_price, old_price):
    query = 'UPDATE product SET name = ?, price = ? WHERE name = ? AND price = ?'
    parameters = (new_name, new_price,name, old_price)
    self.run_query(query, parameters)
    self.edit_wind.destroy()
    self.message['text'] = 'Record {} updated successfylly'.format(name)
    self.get_products()


if __name__ == '__main__':
 window = Tk()
 application = Product(window)
 window.mainloop()