code: def show_fiff(
      fname,
      indent="    ",
      read_limit=np.inf,
      max_str=30,
      output=str,
      tag=None,
      *,
      show_bytes=False,
      verbose=None,
  ):
      """Show FIFF information.
  
      This function is similar to mne_show_fiff.
  
      Parameters
      ----------
      fname : path-like
          Filename to evaluate.
      indent : str
          How to indent the lines.
      read_limit : int
          Max number of bytes of data to read from a tag. Can be np.inf
          to always read all data (helps test read completion).
      max_str : int
          Max number of characters of string representation to print for
          each tag's data.
      output : type
          Either str or list. str is a convenience output for printing.
      tag : int | None
          Provide information about this tag. If None (default), all information
          is shown.
      show_bytes : bool
          If True (default False), print the byte offsets of each tag.
      %(verbose)s
  
      Returns
      -------
      contents : str
          The contents of the file.
      """
      if output not in [list, str]:
          raise ValueError("output must be list or str")
      if isinstance(tag, str):  # command mne show_fiff passes string
          tag = int(tag)
      f, tree, directory = fiff_open(fname)
      # This gets set to 0 (unknown) by fiff_open, but FIFFB_ROOT probably
      # makes more sense for display
      tree["block"] = FIFF.FIFFB_ROOT
      with f as fid:
          out = _show_tree(
              fid,
              tree,
              indent=indent,
              level=0,
              read_limit=read_limit,
              max_str=max_str,
              tag_id=tag,
              show_bytes=show_bytes,
          )
      if output is str:
          out = "\n".join(out)
      return out
  
imports: import os.path
  from gzip import GzipFile
  from io import SEEK_SET, BytesIO
  import numpy
  from scipy.sparse import issparse
  from ..utils import _file_like, logger, verbose, warn
  from .constants import FIFF
  from .tag import Tag, _call_dict_names, _matrix_info, _read_tag_header, read_tag
  from .tree import dir_tree_find, make_dir_tree
label_desc: Use image node_id 5 for calling a global function with example usage: show_fiff(fname, indent, read_limit, max_str, output, tag) and returns: out