class_docstr: Wrapper around python map() output object that preserves the original collection length
  by implementing __len__.
code: def __getitem__(self, key):
      return self.mapobj.__getitem__(key)
  
imports: import os
  import sys
  import time
  import heapq
  import semver
  import random
  from multiprocessing import Pool
  from collections import namedtuple
label_desc: Use image node_id 4 for calling the LenMap obj's underlying member method code with example usage: obj.__getitem__(key) and returns: self