Bisection Method with Python

Question

I am developing a program to calculate numerical methods. Start by confinement methods, in this case one of them is the bisection.

I’m not being able to print the iterations that the method performs... I created a generic function for the method, but when I call it inside mine if responsible for the method chosen by the user, it does not return any value...

def bisection(f, a, b, valor_tolerancia, numero_iteracoes):

    i = 1
    fa = f(a)

    while i <= numero_iteracoes:
        x = a+(a-b)/2.0
        fx = f(x)

        if ((f(x) == 0) or ((b-a)/2.0 < valor_tolerancia):
            return x
        else:
            i = i + 1
            if (f(a)*f(x) > 0):
                a = x
                fa = fx
            else:
                b = x
    raise NameError("Você excedeu o Numéro de Iterações!");


if metodo_escolhido == 1:
    print("# Método da Bisecção #")
    print("\n")

    valor_a = float(input("Valor de a: "))
    valor_b = float(input("Valor de b: "))
    valor_tolerancia = float(input("Tolerancia: "))
    numero_iteracoes = float(input("Digite o numero de iterações: "))

calculo_bissec = bisection(f,a,b,valor_tolerancia,num)
print(calculo_bissec)