TypeError: unbound method “method name” must be called with “Class name” instance as first argument (got str instance instead)

Question

I think this should be a simple question to answer.

I have the next classes:

class GruposHandler(webapp.RequestHandler):
    def get(self):
        self.         


        

Answer 1

grupoHandler = GruposHandler

==>

grupoHandler = GruposHandler()

---

UPDATE:

GruposHandler.obtenerPagina() method accepts 3 arguments:
self, pOpcion=None and pMensajeInformacion=None.

Since 2 of them are optional, you don't get:

TypeError: ... takes exactly 3 arguments (2 given)

when calling it like this:

GruposHandler.obtenerPagina("gruposMios", 'Informacion: ...')

Instead GruposHandler.obtenerPagina() interprets arguments like this:

self="gruposMios", pOpcion='Informacion: ...', pMensajeInformacion=None

and raises:

TypeError: ... must be called with instance (got str instance instead)

To get rid of the exception, you need to call this method from instance:

GruposHandler().obtenerPagina("gruposMios", 'Informacion: ...')

and self will be passed to obtenerPagina implicitly.