code: def _check_decimal(
      self, lines: list[list[Scalar]]
  ) -> list[list[Scalar]]:
      if self.decimal == parser_defaults["decimal"]:
          return lines
  
      return self._search_replace_num_columns(
          lines=lines, search=self.decimal, replace="."
      )
  
imports: from __future__ import annotations
  from collections import abc, defaultdict
  import csv
  from io import StringIO
  import re
  import sys
  from typing import IO, TYPE_CHECKING, DefaultDict, Hashable, Iterator, List, Literal, Mapping, Sequence, cast
  import numpy
  from pandas._libs import lib
  from pandas._typing import ArrayLike, ReadCsvBuffer, Scalar
  from pandas.errors import EmptyDataError, ParserError
  from pandas.core.dtypes.common import is_integer
  from pandas.core.dtypes.inference import is_dict_like
  from pandas.io.common import dedup_names, is_potential_multi_index
  from pandas.io.parsers.base_parser import ParserBase, parser_defaults
label_desc: Use image node_id 19 for calling the PythonParser obj's underlying member method code with example usage: obj._check_decimal(lines) and returns: self, lines