code: def _iter_lexerclasses(plugins=True):
      """Return an iterator over all lexer classes."""
      for key in sorted(LEXERS):
          module_name, name = LEXERS[key][:2]
          if name not in _lexer_cache:
              _load_lexers(module_name)
          yield _lexer_cache[name]
      if plugins:
          for lexer in find_plugin_lexers():
              yield lexer
  
imports: import re
  import sys
  import types
  import fnmatch
  from os.path import basename
  from pygments.lexers._mapping import LEXERS
  from pygments.modeline import get_filetype_from_buffer
  from pygments.plugin import find_plugin_lexers
  from pygments.util import ClassNotFound, itervalues, guess_decode, text_type
label_desc: Use image node_id 11 for calling a global function with example usage: _iter_lexerclasses(plugins) without return types