code: def __str__(self):
      # e.g. returns ' total=12 3->4 4->6 -1->2'
      return " total={0} {1}".format(
          str(self.total_count),
          " ".join(
              [
                  "{0} -> {1}".format(word, count)
                  for word, count in self.word_to_count.items()
              ]
          ),
      )
  
imports: import argparse
  import math
  import sys
  from collections import defaultdict
label_desc: Use image node_id 3 for calling the CountsForHistory obj's underlying member method code with example usage: obj.__str__() and returns: str