How can I send information from one form to another FLASK route?

What I want to do is a program that uses a form to receive data to perform some functions in python code, until here everything is fine, my problem is that if I want to print the result on my web page, I have to have saved the values in cache, because if I do not boot the error 'local variable' result 'referenced before assignment' what I want to do is send this information from the form, to another route, so that it already has the information saved and it can fully load , but I do not know how to send the information or how to consume it in the "app.py"

================ FILE app.py ================================= / p>

 @app.route('/biseccion', methods = ['GET', 'POST'])
 def biseccion():
    fbiseccion = forms.FormularioBiseccion(request.form)
    print 'pryeba'
    print fbiseccion.data
    if request.method == 'POST':
       print fbiseccion.xi.data
       print fbiseccion.xs.data
       print fbiseccion.error.data
       print fbiseccion.iteraciones.data
       xistring = fbiseccion.xi.data
       xstring = fbiseccion.xs.data
       errorstring =  fbiseccion.error.data
       iteracionesstring = fbiseccion.iteraciones.data
       xi = float(xistring)
       xs = float(xstring)
       error = float(errorstring)
       iteraciones =float(iteracionesstring)
       from metodo import f
       from metodo import biseccion
       resultado =biseccion(xi,xs,error,iteraciones)
       # print(biseccion(xi,xs,error,iteraciones))


     return render_template('biseccion.html', form = fbiseccion, resultado=resultado)

=============== FORMS.py ===============

    from wtforms import Form
    from wtforms import StringField

    class FormularioBiseccion(Form):
        xi=StringField('Introduce el valor de xi: ')
        xs=StringField('Introduce el valor de xs: ')
        error=StringField('Introduce la tolerancia: ')
        iteraciones =StringField('Dame el numero de iteraciones: ')