class_docstr: Helper class to return a subsequence of values.
code: def __init__(self, seq):
      self.seq = tuple(seq)
  
imports: from __future__ import annotations
  from sympy.core import Symbol
  from sympy.utilities.iterables import iterable
label_desc: Use image node_id 1 to create a new _ItemGetter object  with example: obj = _ItemGetter(seq)