from tkinter import *
def seleccionar():
    texto = ""
    if (leite.get()):
        texto += "Café com leite"
    else:
        texto += "Café sem leite"

    if (acucar.get()):
        texto += " e com açúcar"
    else:
        texto += " e sem açúcar"

    monitor.config(text=texto)
root = Tk()
root.title("Servir Café")
root.geometry("300x300")
root.resizable(0,0)
root.configure(bg="#cfe2f3")
leite = IntVar()
acucar = IntVar()
Label(text="Como quer o Café?",
      font=("Arial", "15", "bold"),
      bg="#cfe2f3",fg="#bf9000").place(relx=0.2, rely=0.05)
a1=Checkbutton(text="Com Leite", variable=leite, onvalue=1,
            offvalue=0, command=seleccionar,font=("Arial", "12", "bold"),bg="#cfe2f3",fg="#0b5394").place(relx=0.3, rely=0.3)
a2=Checkbutton( text="Com açúcar", variable=acucar, onvalue=1,
            offvalue=0, command=seleccionar,font=("Arial", "12", "bold"),bg="#cfe2f3",fg="#0b5394").place(relx=0.3, rely=0.45)
monitor = Label(bg="#cfe2f3",font=("Arial", "12", "bold"),fg="blue")
monitor.place(relx=0.13, rely=0.65)
root.mainloop()