code: def _xlsx_cells(
      wb: Workbook,
      defaults: tuple,
      parameters: dict,
      start_point: Union[str, int],
      end_point: Union[str, int],
      include_blank_cells: bool,
  ):
      """
      Function to process a single sheet. Returns a DataFrame.
  
      Args:
          wb: Openpyxl Workbook.
          defaults: Sequence of default cell attributes.
          parameters: Dictionary of cell attributes to be retrieved.
              that will always be returned as columns.
          start_point: start coordinates of the Excel sheet.
          end_point: end coordinates of the Excel sheet.
          include_blank_cells: Determines if empty cells should be included.
          path_is_workbook: True/False.
  
      Returns:
          A pandas DataFrame.
      """
  
      if start_point:
          wb = wb[start_point:end_point]
      wb = chain.from_iterable(wb)
      frame = defaultdict(list)
  
      for cell in wb:
          if (cell.value is None) and (not include_blank_cells):
              continue
          for value in defaults:
              frame[value].append(getattr(cell, value, None))
          for parent, boolean_value in parameters.items():
              check(f"The value for {parent}", boolean_value, [bool])
              if not boolean_value:
                  continue
              boolean_value = _object_to_dict(
                  getattr(cell, parent, None)
              )
              frame[parent].append(boolean_value)
  
      return pd.DataFrame(frame, copy=False)
  
file_path: pyjanitor/janitor/io.py
imports: from __future__ import annotations
  import inspect
  import os
  import subprocess
  from collections import defaultdict
  from glob import glob
  from io import StringIO
  from itertools import chain
  from typing import TYPE_CHECKING, Any, Iterable, NamedTuple, Union
  import pandas
  from .errors import JanitorError
  from .utils import check, deprecated_alias, import_message
label_desc: Use image node_id 5 for calling a global function with example usage: _xlsx_cells(wb, defaults, parameters, start_point, end_point, include_blank_cells) and returns: pd