class_docstr: A dictionary-like object that welcomes guests without reservations and
  adds them to the end of the guest list.
class_docstr_tok: ["A","dictionary-like","object","that","welcomes","guests","without","reservations","and","adds","them","to","the","end","of","the","guest","list","."]
code: def __getitem__(self, v):
      if id(v) not in self.s:
          self.s.add(id(v))
          self.l.append(v)
      return v
  
imports: from fontTools.misc.timeTools import timestampNow
  from fontTools.ttLib.tables.DefaultTable import DefaultTable
  from functools import reduce
  import operator
  import logging
label_desc: Use image node_id 2 for calling the GregariousIdentityDict obj's underlying member method code with example usage: obj.__getitem__(v) and returns: v