Taxa de Rentabilidade Total

from tkinter import *
root = Tk()
root.geometry("400x400")
root.resizable(0, 0)
root.config(bg="#5373a6")
root.title("Taxa de Rentabilidade Total")
titulo = Label(text="Taxa de Rentabilidade Total",
               font=("Arial", "20", "bold"),bg="#5373a6",fg="#c5ede7")
titulo.place(relx=0.05, rely=0.05)
texto_sub1  = Label(text="Valor Actual:",
                    font=("Arial", "14", "bold"),bg="#5373a6",fg="#c5ede7")
texto_sub1.place(relx=0.15, rely=0.2)

texto_sub2= Label(text="Valor Inicial:",
                    font=("Arial", "14", "bold"),bg="#5373a6",fg="#c5ede7")
texto_sub2.place(relx=0.15, rely=0.35)

texto_sub3= Label(text="Rendimento:",
                    font=("Arial", "14", "bold"),bg="#5373a6",fg="#c5ede7")
texto_sub3.place(relx=0.15, rely=0.48)

Valo_Actual = DoubleVar()
Valo_Actual_entrada = Entry(textvariable=Valo_Actual,
                             font=("Arial", "12", "bold"),
                             bg="white", fg="blue", justify='center')
Valo_Actual_entrada.place(relx=0.5, rely=0.2, relwidth=0.35)

Valo_Inicial = DoubleVar()
Valo_Inicial_entrada = Entry(textvariable=Valo_Inicial,
                             font=("Arial", "12", "bold"),
                             bg="white", fg="blue", justify='center')
Valo_Inicial_entrada.place(relx=0.5, rely=0.35, relwidth=0.35)

rendimento = DoubleVar()
rendimento_entrada = Entry(textvariable=rendimento,
                             font=("Arial", "12", "bold"),
                             bg="white", fg="blue", justify='center')
rendimento_entrada.place(relx=0.5, rely=0.48, relwidth=0.35)


def app():
    va = Valo_Actual.get()
    vi = Valo_Inicial.get()
    r = rendimento.get()
    d = va-vi + r
    TRT = (d/vi)*100
    TRTarr = round(TRT,2)
    mensagem = f"A Taxa de Rentabilidade Total é de {TRTarr} %. "
    resultado.set(mensagem)

def limpar():
    Valo_Inicial_entrada.delete(0, END)
    Valo_Actual_entrada.delete(0, END)
    rendimento_entrada.delete(0, END)
    resultado.set("")
but1 = Button(text="Calcular", bd=2, bg='#107db2', fg='white',
              font=('verdana', 12, 'bold'), command=app)
but1.place(relx=0.05, rely=0.6, relwidth=0.25, relheight=0.1)
but_limpar = Button(text="Limpar", bd=2, bg='#107db2', fg='white',
                    font=('verdana', 12, 'bold'), command=limpar)
but_limpar.place(relx=0.35, rely=0.6, relwidth=0.25, relheight=0.1)

but_sair = Button(text="Sair", bd=2, bg='#107db2', fg='white',
                    font=('verdana', 12, 'bold'), command=root.destroy)
but_sair.place(relx=0.65, rely=0.6, relwidth=0.25, relheight=0.1)
resultado = StringVar()
resultado_texto = Label(textvariable=resultado,
                           font=("Arial", 12, "bold"), bg="#cfe2f3")
resultado_texto.place(relx=0.05, rely=0.8, relwidth=0.9,relheight=0.15)
root.mainloop()
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Taxa de Rentabilidade Total
