text: from typing import Union
  
  import numpy as np
  import talib
  
  from jesse.helpers import get_candle_source
  from jesse.helpers import slice_candles
  
  
  def t3(candles: np.ndarray, period: int = 5, vfactor: float = 0, source_type: str = "close",
         sequential: bool = False) -> Union[float, np.ndarray]:
      """
      T3 - Triple Exponential Moving Average (T3)
  
      :param candles: np.ndarray
      :param period: int - default: 5
      :param vfactor: float - default: 0
      :param source_type: str - default: "close"
      :param sequential: bool - default=False
  
      :return: float | np.ndarray
      """
      if len(candles.shape) == 1:
          source = candles
      else:
          candles = slice_candles(candles, sequential)
          source = get_candle_source(candles, source_type=source_type)
  
      res = talib.T3(source, timeperiod=period, vfactor=vfactor)
  
      return res if sequential else res[-1]
  