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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
#!/usr/bin/env python
# -*- coding: utf-8 -*-
#

import tkinter as tk
from tkinter import ttk


ventana = tk.Tk()
ventana.title("Posicionamiento grid")
ventana.config()

caja = ttk.Entry()
caja.grid(row=0, column=0)
caja = ttk.Entry()
caja.grid(row=0, column=1, sticky="nsew", padx=70, pady=50)
caja = ttk.Entry()
caja.grid(row=1, column=0, columnspan=2)

ventana.rowconfigure(0, weight=1)



ventana.mainloop()