code: def bollinger_hband(close, window=20, window_dev=2, fillna=False):
      """Bollinger Bands (BB)
  
      Upper band at K times an N-period standard deviation above the moving
      average (MA + Kdeviation).
  
      https://en.wikipedia.org/wiki/Bollinger_Bands
  
      Args:
          close(pandas.Series): dataset 'Close' column.
          window(int): n period.
          window_dev(int): n factor standard deviation
          fillna(bool): if True, fill nan values.
  
      Returns:
          pandas.Series: New feature generated.
      """
      indicator = BollingerBands(
          close=close,
          window=window,
          window_dev=window_dev,
          fillna=fillna,
      )
      return indicator.bollinger_hband()
  
imports: import numpy
  import pandas
  from ta.utils import IndicatorMixin
label_desc: Use image node_id 3 for calling a global function with example usage: bollinger_hband(close, window, window_dev, fillna) and returns: indicator