class_docstr: Partitions a sequence in a round robin fashion.
  
  This currently does not work!
code: def flatten_list(self, listOfPartitions):
      flat = []
      for i in range(len(listOfPartitions[0])):
          flat.extend(
              [part[i] for part in listOfPartitions if len(part) > i]
          )
      return flat
  
file_path: ipyparallel/ipyparallel/client/map.py
imports: import sys
  from itertools import chain, islice
label_desc: Use image node_id 4 for calling the RoundRobinMap obj's underlying member method code with example usage: obj.flatten_list(listOfPartitions) and returns: flat