class_docstr: The API necessary to provide a new Parquet reader/writer
code: def default_blocksize(cls):
      return "256 MiB"
  
imports: from __future__ import annotations
  import re
  import warnings
  import numpy
  import pandas
  from fsspec.core import expand_paths_if_needed, get_fs_token_paths, stringify_path
  from fsspec.spec import AbstractFileSystem
  from dask import config
  from dask.dataframe.io.utils import _is_local_fs
  from dask.utils import natural_sort_key, parse_bytes
label_desc: Use image node_id 3 for calling the Engine obj's underlying member method code with example usage: obj.default_blocksize(cls) and returns: str