code: def get_all_styles():
      """Return a generator for all styles by name, both builtin and plugin."""
      for v in STYLES.values():
          yield v[1]
      for name, _ in find_plugin_styles():
          yield name
  
imports: from pygments.plugin import find_plugin_styles
  from pygments.util import ClassNotFound
  from pygments.styles._mapping import STYLES
label_desc: Use image node_id 2 for calling a global function with example usage: get_all_styles() without return types