class_docstr: An external list for list.
  
  Examples
  --------
  >>> l = ExternalListOfList([[i, i] for i in range(100)])
  >>> len(l)
  200
  >>> l.append(range(10))
  >>> len(l)
  210
  >>> len(list(l))
  210
class_docstr_tok: ["An","external","list","for","list",".","Examples","--","--","--","--",">",">",">","l","=","ExternalListOfList","(","[","[","i",",","i","]","for","i","in","range","(","100",")","]",")",">",">",">","len","(","l",")","200",">",">",">","l.append","(","range","(","10",")",")",">",">",">","len","(","l",")","210",">",">",">","len","(","list","(","l",")",")","210"]
code: def __init__(self, values):
      ExternalList.__init__(self, values)
      self.count = sum(len(i) for i in values)
  
imports: import os
  import platform
  import shutil
  import warnings
  import gc
  import itertools
  import operator
  import random
  import sys
  import heapq
  from pyspark.serializers import BatchedSerializer, CPickleSerializer, FlattenedValuesSerializer, CompressedSerializer, AutoBatchedSerializer
  from pyspark.util import fail_on_stopiteration
label_desc: Use image node_id 1 to create a new ExternalListOfList object from inherited base classes: ExternalList with example: obj = ExternalListOfList(values)