import tkinter as tk

janela = tk.Tk()
janela.title("calculadora")

entrada = tk.entry(janela, width=20, font=("arial, 18"))
entrada = tk.Entry(Root)
entrada.grid(row=0, column=0 columnspan=4, pady=10 padx=10)

botoes = [
    ("7","1","0") ("8","1","1") ("9","1","2") ("/","1","3")
    ("4","2","0") ("5","2","1") ("6","2","2") ("*","2","3")
    ("1","3","0") ("2","3","1") ("3","3","2") ("-","3","3")
    ("0","4","0") (".","4","1") ("c","4","2") ("+","4","3")
    ("=","5","0") ]

for (texto, linha, coluna) in botoes:
    tk.Button(janela, text=texto width=5 height=2, font=("arial")) 
    texto.grid(row=linha, column=coluna, padx=5, pady=5)

janela.mainloop