from tkinter import *
root =Tk()
class francao():
    def __init__(self):
        self.root = root
        self.janela()
        self.frac()
        root.mainloop()
    def janela(self):
        self.root.title("Multiplicação de Fracção")
        self.root.geometry("450x200")
        self.root.resizable(False, False)
    def frac(self):
        self.numerador1 = IntVar()
        self.numerador1_lb = Label(text=" Numerador ",
                                  font=("Helvetica", '10'))
        self.numerador1_lb.place(relx=0.05, rely=0.15)
        self.numerador1_entry = Entry(textvariable=self.numerador1)
        self.numerador1_entry.place(relx=0.25, rely=0.15,relwidth=0.15)

        self.numerador2 = IntVar()
        self.numerador2_entry = Entry(textvariable=self.numerador2)
        self.numerador2_entry.place(relx=0.5, rely=0.15, relwidth=0.15)

        self.divao1 =Label(text="-----------------",
                          font=("Helvetica", '10'))
        self.divao1.place(relx=0.25, rely=0.3)

        self.igual = Label(text="=", font=("Helvetica", '10'))
        self.igual.place(relx=0.7, rely=0.3)

        self.multiplicar = Label(text="x", font=("Helvetica", '10'))
        self.multiplicar.place(relx=0.43, rely=0.3)

        self.divao2 = Label(text="-----------------",
                            font=("Helvetica", '10'))
        self.divao2.place(relx=0.5, rely=0.3)
        self.denominador1 = IntVar()
        self.denominador1_lb = Label(text=" Denominador ",
                                    font=("Helvetica", '10'))
        self.denominador1_lb.place(relx=0.05, rely=0.5)

        self.denominador1_entry = Entry(textvariable=self.denominador1)
        self.denominador1_entry.place(relx=0.25, rely=0.5, relwidth=0.15)
        self.denominador2= IntVar()
        self.denominador2_entry = Entry(textvariable=self.denominador2)
        self.denominador2_entry.place(relx=0.5, rely=0.5, relwidth=0.15)
        # Resultado
        self.resultadodiv = StringVar()
        self.resultadodiv_lb2 = Label(textvariable=self.resultadodiv,
                                         font=("Helvetica", '8'))
        self.resultadodiv_lb2.place(relx=0.75, rely=0.3)

        # Butão de calcular
        self.bt_calcular = Button(text="Calcular", bd=2,
                                  font=('verdana', '8', 'bold'), bg='gray18',
                                  fg='white',
                                  command=self.butao1)
        self.bt_calcular.place(relx=0.4, rely=0.7, relwidth=0.2, relheight=0.1)

    def butao1(self):
            n1 = self.numerador1.get()
            n2= self.numerador2.get()
            d1 = self.denominador1.get()
            d2 = self.denominador2.get()
            n = n1*n2
            d =d1*d2
            # Converter
            a = round((n/d), 2)
            return self.resultadodiv.set(a)
francao()