Fix lint in data_types.py

stone/ir/data_types.py

@@ -689,7 +689,7 @@ def set_default(self, default):
  @property
  def default(self):
  if not self.has_default:
- raise Exception('Type has no default')
+ raise ValueError('Type has no default')
  else:
  return self._default
 
@@ -1382,7 +1382,7 @@ def __init__(self, name, namespace, ast_node, closed):
 
  # TODO: Why is this a different signature than the parent? Is this
  # intentional?
- def set_attributes(self, doc, fields, # pylint: disable=arguments-differ
+ def set_attributes(self, doc, fields,
  parent_type=None, catch_all_field=None):
  """
  :param UnionField catch_all_field: The field designated as the
@@ -1475,7 +1475,6 @@ def _add_example(self, example):
  )
 
  # TODO: are we always guaranteed at least one field?
- # pylint: disable=undefined-loop-variable
  try:
  field.data_type.check_example(example_field)
  except InvalidSpec as e:
@@ -1581,7 +1580,6 @@ def get_json_val(dt, val):
  raise AssertionError('No example for label %r' % label)
 
  # TODO: are we always guaranteed at least one field?
- # pylint: disable=undefined-loop-variable
  assert is_void_type(field.data_type)
  return Example(
  field.name, field.doc, OrderedDict([('.tag', field.name)]))