code: def exclude(self, *fields):
          
  
          if len(fields) == 1 and isinstance(fields[0], list):
              exclude_fields = fields[0]
          else:
              exclude_fields = list(fields)
  
          exclude_fields = [self._defunc(it) for it in exclude_fields]
          exclude_fields = [field.name if not isinstance(field, six.string_types) else field
                            for field in exclude_fields]
  
          fields = [name for name in self._schema.names
                    if name not in exclude_fields]
  
          return self._project(fields)
docs: Projection columns which not included in the fields
  
          :param fields: field names
          :return: new collection
          :rtype: :class:`odps.df.expr.expression.CollectionExpr`