code: def render_all(self, op, exclude=[], opt=None):
          
          opt = self.default() if opt == None else opt
          if not isinstance(op, Operation):
              raise ValueError('Not a Operation: {0}'.format(op))
          if not isinstance(opt, dict):
              raise ValueError('Not a dict: {0}'.format(opt))
  
          template = opt['parameter_template']
          max_p = opt['max_parameter']
          out = {}
          for p in op.parameters:
              if p.name in exclude:
                  continue
              if p.name in template:
                  out.update({p.name: template[p.name]})
                  continue
              if not max_p and not p.required:
                  if random.randint(0, 1) == 0 or opt['minimal_parameter']:
                      continue
              out.update({p.name: self.render(p, opt=opt)})
          return out
docs: render a set of parameter for an Operation
  
          :param op Operation: the swagger spec object
          :param opt dict: render option
          :return: a set of parameters that can be passed to Operation.__call__
          :rtype: dict