code: def get_user(self, username=None):
          
          username = username or self.username or ''
          url = self.url('GET_USER', username=username)
          response = self.dispatch('GET', url)
          try:
              return (response[0], response[1]['user'])
          except TypeError:
              pass
          return response
docs: Returns user informations.
              If username is not defined, tries to return own informations.