code: def checkplot_infokey_worker(task):
      '''This gets the required keys from the requested file.
  
      Parameters
      ----------
  
      task : tuple
          Task is a two element tuple::
  
          - task[0] is the dict to work on
  
          - task[1] is a list of lists of str indicating all the key address to
            extract items from the dict for
  
      Returns
      -------
  
      list
          This is a list of all of the items at the requested key addresses.
  
      '''
      cpf, keys = task
  
      cpd = _read_checkplot_picklefile(cpf)
  
      resultkeys = []
  
      for k in keys:
  
          try:
              resultkeys.append(_dict_get(cpd, k))
          except Exception as e:
              resultkeys.append(np.nan)
  
      return resultkeyf checkplot_infokey_worker(task):
      '''This gets the required keys from the requested file.
  
      Parameters
      ----------
  
      task : tuple
          Task is a two element tuple::
  
          - task[0] is the dict to work on
  
          - task[1] is a list of lists of str indicating all the key address to
            extract items from the dict for
  
      Returns
      -------
  
      list
          This is a list of all of the items at the requested key addresses.
  
      '''
      cpf, keys = task
  
      cpd = _read_checkplot_picklefile(cpf)
  
      resultkeys = []
  
      for k in keys:
  
          try:
              resultkeys.append(_dict_get(cpd, k))
          except Exception as e:
              resultkeys.append(np.nan)
  
      return resultkeys
docs: This gets the required keys from the requested file.
  
      Parameters
      ----------
  
      task : tuple
          Task is a two element tuple::
  
          - task[0] is the dict to work on
  
          - task[1] is a list of lists of str indicating all the key address to
            extract items from the dict for
  
      Returns
      -------
  
      list
          This is a list of all of the items at the requested key addresses.