code: def get_fields_class(self, class_name):
          
          l = []
          for i in self.get_classes():
              for j in i.get_fields():
                  if class_name == j.get_class_name():
                      l.append(j)
  
          return l
docs: Return all fields of a specific class
  
          :param class_name: the class name
          :type class_name: string
  
          :rtype: a list with :class:`EncodedField` objects