old_contents: from .core import (
      infer_vegalite_type,
      sanitize_dataframe,
      parse_shorthand,
      use_signature,
      update_subtraits,
      update_nested,
      display_traceback,
      SchemaBase,
      Undefined
  )
  from .html import spec_to_html
  from .plugin_registry import PluginRegistry
  
  
  __all__ = (
      'infer_vegalite_type',
      'sanitize_dataframe',
      'parse_shorthand',
      'use_signature',
      'update_subtraits',
      'update_nested',
      'display_traceback',
      'SchemaBase',
      'Undefined',
      'PluginRegistry'
  )
  
new_contents: from .core import (
      infer_vegalite_type,
      sanitize_dataframe,
      parse_shorthand,
      use_signature,
      update_subtraits,
      update_nested,
      display_traceback,
      SchemaBase,
      Undefined
  )
  from .html import spec_to_html
  from .plugin_registry import PluginRegistry
  
  
  __all__ = (
      'infer_vegalite_type',
      'sanitize_dataframe',
      'spec_to_html',
      'parse_shorthand',
      'use_signature',
      'update_subtraits',
      'update_nested',
      'display_traceback',
      'SchemaBase',
      'Undefined',
      'PluginRegistry'
  )
  
subject: fix flake8 error