code: def validate_pep8(self):
      if not self.examples:
          return
  
      # F401 is needed to not generate flake8 errors in examples
      # that do not user numpy or pandas
      content = "".join(
          (
              "import numpy as np  # noqa: F401\n",
              "import pandas as pd  # noqa: F401\n",
              *self.examples_source_code,
          )
      )
  
      error_messages = []
  
      file = tempfile.NamedTemporaryFile(
          mode="w", encoding="utf-8", delete=False
      )
      try:
          file.write(content)
          file.flush()
          cmd = [
              "python",
              "-m",
              "flake8",
              "--format=%(row)d\t%(col)d\t%(code)s\t%(text)s",
              "--max-line-length=88",
              "--ignore=E203,E3,W503,W504,E402,E731",
              file.name,
          ]
          response = subprocess.run(
              cmd, capture_output=True, check=False, text=True
          )
          for output in ("stdout", "stderr"):
              out = getattr(response, output)
              out = out.replace(file.name, "")
              messages = out.strip("\n").splitlines()
              if messages:
                  error_messages.extend(messages)
      finally:
          file.close()
          os.unlink(file.name)
  
      for error_message in error_messages:
          (
              line_number,
              col_number,
              error_code,
              message,
          ) = error_message.split("\t", maxsplit=3)
          # Note: we subtract 2 from the line number because
          # 'import numpy as np\nimport pandas as pd\n'
          # is prepended to the docstrings.
          yield error_code, message, int(line_number) - 2, int(
              col_number
          )
  
imports: from __future__ import annotations
  import argparse
  import doctest
  import importlib
  import json
  import os
  import pathlib
  import subprocess
  import sys
  import tempfile
  import matplotlib
  import matplotlib.pyplot
  from numpydoc.docscrape import get_doc_object
  from numpydoc.validate import Validator, validate
label_desc: Use image node_id 5 for calling the PandasDocstring obj's underlying member method code with example usage: obj.validate_pep8() without return types