pack

#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
#
import tkinter as tk
from tkinter import ttk


ventana = tk.Tk()
ventana.title("Posicionamiento PACK")
ventana.config(width=400, height=300)

entry = ttk.Entry()
entry.pack()

boton = ttk.Button(text="HOLA")
boton.pack(side=tk.TOP)

label = ttk.Label(text="Soy una etiqueta")
label.pack(side=tk.BOTTOM)

entry = ttk.Entry()
entry.pack()

label = ttk.Label(text="Soy otra etiqueta")
label.pack(after=boton)

boton = ttk.Button(text="SOY OTRO BOTON")
boton.pack(before=label, padx=30, pady=10, ipadx=50, ipady=50)

entry = ttk.Entry()
entry.insert(0,"Hola mundo cruel")
entry.pack(expand=True, fill=tk.BOTH)


ventana.mainloop()