code: def num2words(matchobj):
      num = matchobj.group(0)
      if num in strings:
          return strings[num]
      else:
          return " <spn> "
  
imports: import csv
  import os
  import re
  import sys
label_desc: Use image node_id 1 for calling a global function with example usage: num2words(matchobj) and returns: strings, str