from tkinter import *
root = Tk()
root.geometry("400x500")
root.resizable(0, 0)
root.config(bg="#105a63")
def limpar():
    Valor_Importado_entrada.delete(0, END)
    Aliquota_Imposto_entrada.delete(0, END)
    Taxa_câmbio_entrada.delete(0, END)
    resultado.set("")
def app():
     v_importado = Valor_Importado.get()
     a_imposto = Aliquota_Imposto.get()
     tx_cambio= Taxa_câmbio.get()
     imposto = v_importado *tx_cambio* a_imposto
     impostoarr = round(imposto,2)
     mensagem = f'Imposto sobre importação:{impostoarr}'
     resultado.set(mensagem)
root.title("Calcular o imposto sobre importação")
titulo = Label(text="Calcular o Imposto sobre Importação",
               font=("Arial", "16", "bold"),bg="#105a63",fg="#b1ebf2")
titulo.place(relx=0.05, rely=0.05)
texto_sub1  = Label(text="Valor Importado:",
                    font=("Arial", "13", "bold"),bg="#105a63",fg="#b1ebf2")
texto_sub1.place(relx=0.15, rely=0.2)

texto_sub2  = Label(text="Aliquota Imposto :",
                    font=("Arial", "13", "bold"),bg="#105a63",fg="#b1ebf2")
texto_sub2.place(relx=0.13, rely=0.3)

texto_sub3  = Label(text="Taxa câmbio :",
                    font=("Arial", "13", "bold"),bg="#105a63",fg="#b1ebf2")
texto_sub3.place(relx=0.13, rely=0.4)
Valor_Importado = DoubleVar()
Valor_Importado_entrada = Entry(textvariable=Valor_Importado,
                             font=("Arial", "12", "bold"),
                             bg="white", fg="blue", justify='center')
Valor_Importado_entrada.place(relx=0.55, rely=0.2, relwidth=0.4)

Aliquota_Imposto = DoubleVar()
Aliquota_Imposto_entrada = Entry(textvariable=Aliquota_Imposto,
                             font=("Arial", "12", "bold"),
                             bg="white", fg="blue", justify='center')
Aliquota_Imposto_entrada.place(relx=0.55, rely=0.3, relwidth=0.4)

Taxa_câmbio = DoubleVar()
Taxa_câmbio_entrada = Entry(textvariable=Taxa_câmbio,
                             font=("Arial", "12", "bold"),
                             bg="white", fg="blue", justify='center')
Taxa_câmbio_entrada.place(relx=0.55, rely=0.4, relwidth=0.4)

but1 = Button(text="Verificar", bd=2, bg='#107db2', fg='white',
              font=('verdana', 12, 'bold'), command=app)
but1.place(relx=0.05, rely=0.55, 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=0.55, 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=0.55, 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=0.7, relwidth=0.9,relheight=0.2)
root.mainloop()