code: def normalize_slice(s, total):
      """
      Return a "canonical" version of slice ``s``.
  
      :param slice s: the original slice expression
      :param total int: total number of elements in the collection sliced by ``s``
      :return slice: a slice equivalent to ``s`` but not containing any negative indices or Nones.
      """
      newstart = (
          0
          if s.start is None
          else max(0, s.start + total)
          if s.start < 0
          else min(s.start, total)
      )
      newstop = (
          total
          if s.stop is None
          else max(0, s.stop + total)
          if s.stop < 0
          else min(s.stop, total)
      )
      newstep = 1 if s.step is None else s.step
      return slice(newstart, newstop, newstep)
  
imports: from .compatibility import *
  import csv
  import contextlib
  import io
  import itertools
  import os
  import re
  import shutil
  import string
  import subprocess
  import sys
  import tempfile
  import zipfile
  from h2o.backend.server import H2OLocalServer
  from h2o.exceptions import H2OValueError
  from h2o.utils.typechecks import assert_is_type, is_type, numeric
  from h2o.utils.threading import local_env
label_desc: Use image node_id 33 for calling a global function with example usage: normalize_slice(s, total) and returns: slice