parameters: (self, exclude=None, only=None)
docstring: This method iterates over all fields that are defined and yields
          ``(key, value)`` tuples.  Per default all fields are returned, but
          it's possible to limit that to some fields by providing the `only`
          parameter or to exclude some using the `exclude` parameter.  Both
          should be sets or tuples of field names.
docstring_summary: This method iterates over all fields that are defined and yields
          ``(key, value)`` tuples.  Per default all fields are returned, but
          it's possible to limit that to some fields by providing the `only`
          parameter or to exclude some using the `exclude` parameter.  Both
          should be sets or tuples of field names.
docstring_tokens: This method iterates over all fields that are defined and yields ( key value ) tuples . Per default all fields are returned but it s possible to limit that to some fields by providing the only parameter or to exclude some using the exclude parameter . Both should be sets or tuples of field names .
function: def iter_fields(self, exclude=None, only=None):
          """This method iterates over all fields that are defined and yields
          ``(key, value)`` tuples.  Per default all fields are returned, but
          it's possible to limit that to some fields by providing the `only`
          parameter or to exclude some using the `exclude` parameter.  Both
          should be sets or tuples of field names.
          """
          for name in self.fields:
              if (exclude is only is None) or \
                 (exclude is not None and name not in exclude) or \
                 (only is not None and name in only):
                  try:
                      yield name, getattr(self, name)
                  except AttributeError:
                      pass
function_tokens: def iter_fields ( self , exclude = None , only = None ) : for name in self . fields : if ( exclude is only is None ) or ( exclude is not None and name not in exclude ) or ( only is not None and name in only ) : try : yield name , getattr ( self , name ) except AttributeError : pass