def ST(high, low, close, atr, prevfinaluband, prevfinallband, prevsupertrend,
       prevclose, multiplier):
    upperbasicband = ((high+low)/2 + (multiplier * atr))
    lowerbasicband = ((high+low)/2 - (multiplier * atr))
    if upperbasicband < prevfinaluband or prevclose > prevfinaluband:
        upperband = upperbasicband
    else:
        upperband = prevfinaluband
    if lowerbasicband > prevfinallband or prevclose < prevfinallband:
        lowerband = lowerbasicband
    else:
        lowerband = prevfinallband

    if prevsupertrend == prevfinaluband:
        if close <= upperband:
            supertrend = upperband
        else:
            supertrend = lowerband
    else:
        if prevsupertrend == prevfinallband:
            if close >= lowerband:
                supertrend = lowerband
            else:
                supertrend = upperband
        else:
            supertrend = 0.0

    return upperbasicband, lowerbasicband, upperband, lowerband, supertrend



for i in range(1, len(stockdata)):
    if np.isnan(stockdata['atr'][i]):
        continue
    uband, lband, finaluband, finallband, supert =
        customindicator.ST(stockdata['high'][i], stockdata['low'][i],
           stockdata['close'][i], stockdata['atr'][i],
           stockdata['finaluband'][i-1], stockdata['finallband'][i-1],
            stockdata['supert'][i-1], stockdata['close'][i-1],
            multiplier =7)