如何用Python构建aroon指示器

我正在尝试使用pandas在python中创建aroon指示符。然而，我得到了错误的值。。。有谁能帮我指出我哪里出了问题

import pandas as pd
import Bitmex_OHLC
import numpy as np
import importlib

def aroon():
    importlib.reload(Bitmex_OHLC)
    df_aroon = Bitmex_OHLC.OHLC()
    df_aroon['14L_min'] = df_aroon['low'].rolling(window=14,min_periods=0).min()
    df_aroon['14H_max'] = df_aroon['high'].rolling(window=14,min_periods = 0).max()
    df_aroon['ind'] = range(0,len(df_aroon))
    # recent_high = df_aroon.iloc[-1]["25d High"]
    df_aroon['high_ind'] = df_aroon['ind'].where(df_aroon["14H_max"]==df_aroon['high']).fillna(method = 'ffill')
    df_aroon['low_ind'] = df_aroon['ind'].where(df_aroon["14L_min"] == df_aroon['low']).fillna(method = 'ffill')
    df_aroon['since_high'] = df_aroon['ind']-df_aroon['high_ind']
    df_aroon['since_low'] = df_aroon['ind'] - df_aroon['low_ind']
    df_aroon['up'] = (((14 - df_aroon['since_high'])/14) *100)
    df_aroon['down'] = (((14 - df_aroon['since_low']) / 14) * 100)
    return (df_aroon)

print(aroon().tail())

（向下）列的值应始终为正，（因为_低）列的值应小于14

任何帮助都将不胜感激。。塔克斯

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使用python中的ta lib库创建股票指标。这里是链接