code: def _make_reader(self, f: IO[str] | ReadCsvBuffer[str]) -> None:
      sep = self.delimiter
  
      if sep is None or len(sep) == 1:
          if self.lineterminator:
              raise ValueError(
                  "Custom line terminators not supported in python parser (yet)"
              )
  
          class MyDialect(csv.Dialect):
              delimiter = self.delimiter
              quotechar = self.quotechar
              escapechar = self.escapechar
              doublequote = self.doublequote
              skipinitialspace = self.skipinitialspace
              quoting = self.quoting
              lineterminator = "\n"
  
          dia = MyDialect
  
          if sep is not None:
              dia.delimiter = sep
          else:
              # attempt to sniff the delimiter from the first valid line,
              # i.e. no comment line and not in skiprows
              line = f.readline()
              lines = self._check_comments([[line]])[0]
              while self.skipfunc(self.pos) or not lines:
                  self.pos += 1
                  line = f.readline()
                  lines = self._check_comments([[line]])[0]
              lines_str = cast(List[str], lines)
  
              # since `line` was a string, lines will be a list containing
              # only a single string
              line = lines_str[0]
  
              self.pos += 1
              self.line_pos += 1
              sniffed = csv.Sniffer().sniff(line)
              dia.delimiter = sniffed.delimiter
  
              # Note: encoding is irrelevant here
              line_rdr = csv.reader(StringIO(line), dialect=dia)
              self.buf.extend(list(line_rdr))
  
          # Note: encoding is irrelevant here
          reader = csv.reader(f, dialect=dia, strict=True)
  
      else:
  
          def _read():
              line = f.readline()
              pat = re.compile(sep)
  
              yield pat.split(line.strip())
  
              for line in f:
                  yield pat.split(line.strip())
  
          reader = _read()
  
      # error: Incompatible types in assignment (expression has type "_reader",
      # variable has type "Union[IO[Any], RawIOBase, BufferedIOBase, TextIOBase,
      # TextIOWrapper, mmap, None]")
      self.data = reader
  
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 2 for calling the PythonParser obj's underlying member method code with example usage: obj._make_reader(f) without return types