code: def get_all_styles():
      """Return an generator for all styles by name,
      both builtin and plugin."""
      for name in STYLE_MAP:
          yield name
      for name, _ in find_plugin_styles():
          yield name
  
imports: from pygments.plugin import find_plugin_styles
  from pygments.util import ClassNotFound
label_desc: Use image node_id 2 for calling a global function with example usage: get_all_styles() without return types