class_docstr: RedisTimeSeries Commands.
class_docstr_tok: ["RedisTimeSeries","Commands","."]
docstr: Append FILTER_BY_TS property to params.
docstr_tok: ["Append","FILTER_BY_TS","property","to","params","."]
code: def _append_filer_by_ts(
      params: List[str], ts_list: Optional[List[int]]
  ):
      """Append FILTER_BY_TS property to params."""
      if ts_list is not None:
          params.extend(["FILTER_BY_TS", *ts_list])
  
imports: from typing import Dict, List, Optional, Tuple, Union
  from redis.exceptions import DataError
  from redis.typing import KeyT, Number
label_desc: Use image node_id 31 for calling the TimeSeriesCommands obj's underlying member method code with example usage: obj._append_filer_by_ts(params, ts_list) without return types