Python 生成boll 指数代码

可以使用以下代码生成布林带指数：

import pandas as pd
import numpy as np

def bollinger_bands(close_prices, window_size, num_std):
    rolling_mean = close_prices.rolling(window=window_size).mean()
    rolling_std = close_prices.rolling(window=window_size).std()
    upper_band = rolling_mean + (rolling_std * num_std)
    lower_band = rolling_mean - (rolling_std * num_std)
    return rolling_mean, upper_band, lower_band

# 示例
close_prices = pd.Series(np.random.randn(100))
window_size = 20
num_std = 2
rolling_mean, upper_band, lower_band = bollinger_bands(close_prices, window_size, num_std)