code: def dictlist_convert_to_datetime(dict_list: Iterable[Dict],
                                   key: str,
                                   datetime_format_string: str) -> None:
      
      for d in dict_list:
          d[key] = datetime.datetime.strptime(d[key], datetime_format_string)
docs: Process an iterable of dictionaries. For each dictionary ``d``, convert
      (in place) ``d[key]`` to a ``datetime.datetime`` form, using
      ``datetime_format_string`` as the format parameter to
      :func:`datetime.datetime.strptime`.