tkinter Python 3空白窗口问题

Question

我是菜鸟，我已经研究了该网站和Google上有关此问题的许多答案。最令人困惑的部分是编写简单“窗口”的多种方法。我对何时使用“自我”感到困惑。但是，有人可以帮助解决我看不见的“标签”吗？谢谢

代码：

# !/usr/bin/python3
from tkinter import *
from tkinter import ttk
import tkinter as tk

class Window(Tk):
    def __init__(self):
        tk.Tk.__init__(self)
        self.title('WEATHER  STATION')
        self.minsize(500, 300)

    def create_layout(self):
        self.label_1 = Label(window, text = 'Temperature:        F', fg = 'black', font = ('Helvetica', 18))
        self.label_1.pack(anchor = 'w')
        self.var = tk.IntVar()
        self.label_2 = Label(window, textvariable = self.var, fg = 'black', font = ('Helvetica', 18)) .place(x = 150, y = 1)
        self.var.set('500')

window = Window()
window.mainloop()