title: the tkinter widgets in my classes are not displaying
body: <p>I'm trying to write a code that contains multiple pages and can be switched to when a button is clicked on. it worked initially but my widgets are not displaying, and there is neither a warning or an error message. Secondly, what is the difference between using tk and tk.TK? </p>
  
  <pre><code>from tkinter import *
  import tkinter as tk
  
  class moreTab(tk.Tk):
      def __init__(self):
          Tk.__init__(self)
          self.geometry("1200x600")
          container = Frame(self, bg='#c9e3c1')
          container.pack(side = "top", fill = 'both', expand = True)
          container.grid_rowconfigure(0, weight = 1)
          container.grid_columnconfigure(0, weight = 1)
          self.frames = {}
          for q in (pageone, widget):
              frame = q(container,self)
              self.frames[q] = frame
              frame.place(x= 0,y = 0)
          self.raise_frame(pageone)
      def raise_frame(self,cont):
          frame = self.frames[cont]
          frame.tkraise()
  
  class widget(Frame):
      def __init__(self, master, control):
          Frame.__init__(self, master)
  
          lab = tk.Label(self, text="main page")
          lab.place(x = 10, y = 40)
          but = tk.Button(self, text='visit start page', command=lambda: 
  control.raise_frame(pageone))
          but.place(x = 10, y = 70)
  class pageone(Frame):
      def __init__(self, master, control):
          Frame.__init__(self,master)
          lab = Label(self, text = 'welcome to Game Analysis')
          lab.place(x = 10, y = 10)
          but = Button(self, text = "Start", command  = lambda: 
  control.raise_frame(widget))
          but.place(x = 10, y = 20)
  
  app = moreTab()
  app.mainloop()
  </code></pre>