code: def _slices_for_len(L):
      # Example slices for a dimension of length L
      return (
          L // 2,
          slice(None, None, 1),
          slice(None, L // 2, 1),
          slice(None, None, L // 2),
      )
  
file_path: nibabel/nibabel/benchmarks/bench_fileslice.py
imports: import sys
  from io import BytesIO
  from timeit import timeit
  import numpy
  from ..fileslice import fileslice
  from ..openers import ImageOpener
  from ..optpkg import optional_package
  from ..rstutils import rst_table
  from ..tmpdirs import InTemporaryDirectory
label_desc: Use image node_id 1 for calling a global function with example usage: _slices_for_len(L) and returns: unknown,  slice,  slice,  slice