class_docstr: An immutable sequence implementation (actually a tuple) optimized for fast lookups.
  Some code needs both random/indexed access on large lists and do many lookups `elem in my_list` (e.g. in a loop),
  it is recommended to use this class in that case to avoid forgetting to build or use a set every time we need a lookup. 
  
  Note that this list is read-only as we don't want to have to synchronize the backed set used for the lookups.
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docstr: use this for arithmetic operations on the elements to avoid confusion.
  We still want this to behave like a list for the most part, 
  and this is slightly faster than building a set from the list itself.
docstr_tok: ["use","this","for","arithmetic","operations","on","the","elements","to","avoid","confusion",".","We","still","want","this","to","behave","like","a","list","for","the","most","part",",","and","this","is","slightly","faster","than","building","a","set","from","the","list","itself","."]
code: def set(self):
      """
      use this for arithmetic operations on the elements to avoid confusion.
      We still want this to behave like a list for the most part,
      and this is slightly faster than building a set from the list itself.
      """
      return self.__set
  
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 4 for calling the LookupSeq obj's underlying member method code with example usage: obj.set() and returns: self