code: def _importers() -> None:
      # import things we need
      # but make this done on a first use basis
  
      global _IMPORTS
      if _IMPORTS:
          return
  
      global _HAS_BS4, _HAS_LXML, _HAS_HTML5LIB
      bs4 = import_optional_dependency("bs4", errors="ignore")
      _HAS_BS4 = bs4 is not None
  
      lxml = import_optional_dependency("lxml.etree", errors="ignore")
      _HAS_LXML = lxml is not None
  
      html5lib = import_optional_dependency("html5lib", errors="ignore")
      _HAS_HTML5LIB = html5lib is not None
  
      _IMPORTS = True
  
imports: from __future__ import annotations
  from collections import abc
  import numbers
  import re
  from typing import TYPE_CHECKING, Iterable, Literal, Pattern, Sequence, cast
  from pandas._libs import lib
  from pandas._typing import BaseBuffer, DtypeBackend, FilePath, ReadBuffer
  from pandas.compat._optional import import_optional_dependency
  from pandas.errors import AbstractMethodError, EmptyDataError
  from pandas.util._validators import check_dtype_backend
  from pandas.core.dtypes.common import is_list_like
  from pandas import isna
  from pandas.core.indexes.base import Index
  from pandas.core.indexes.multi import MultiIndex
  from pandas.core.series import Series
  from pandas.io.common import file_exists, get_handle, is_url, stringify_path, urlopen, validate_header_arg
  from pandas.io.formats.printing import pprint_thing
  from pandas.io.parsers import TextParser
label_desc: Use image node_id 1 for calling a global function with example usage: _importers() without return types