code: def pp(el, preString=""):
      """
      Formats (prettyprint) a concatenated dictionary
      """
      tab = " " * 4
      if isinstance(el, dict):
          keys = list(el.keys())
          keys.sort()
          for key in keys:
              val = el[key]
              if isinstance(val, dict) or isinstance(val, list):
                  print("%s%s :" % (preString, key))
                  pp(val, preString + tab)
              else:
                  print("%s%s  =  %s" % (preString, key, val))
  
      elif isinstance(el, list):
          print(preString + tab + "[")
          preString += tab
          for _ in el:
              if isinstance(_, dict):
                  print(preString + tab + "{")
                  pp(_, preString + tab * 2)
                  print(preString + tab + "}")
              elif isinstance(_, list):
                  print(preString + tab + "[")
                  pp(_, preString + tab)
                  print(preString + tab + "]")
              else:
                  pp(_, preString + tab)
              # print preString+'      '+str('-')*10
          print(preString + "]")
      else:
          print(preString + str(el))
  
imports: import pickle
  import six
  import copy
label_desc: Use image node_id 10 for calling a global function with example usage: pp(el, preString) without return types