python - 索引错误 : Replacement index 1 out of range for positional args tuple

Question

我正在学习教程，但不知道为什么会出现此错误:

    <ipython-input-61-d59f7a5a07ab> in extract_featuresets(ticker)
      2     tickers, df = process_data_for_labels(ticker)
      3     df['{}_target'.format(ticker)] = list(map(buy_sell_hold,
----> 4                                              df['{}_{}1d'.format(ticker)],
      5                                              df['{}_{}2d'.format(ticker)],
      6                                              df['{}_{}3d'.format(ticker)],

IndexError: Replacement index 1 out of range for positional args tuple

这是我的代码:

tickers, df = process_data_for_labels(ticker)
df['{}_target'.format(ticker)] = list(map(buy_sell_hold,
                                         df['{}_{}1d'.format(ticker)],
                                         df['{}_{}2d'.format(ticker)],
                                         df['{}_{}3d'.format(ticker)],
                                         df['{}_{}4d'.format(ticker)],
                                         df['{}_{}5d'.format(ticker)],
                                         df['{}_{}6d'.format(ticker)],
                                         df['{}_{}7d'.format(ticker)],))

这是教程的链接: https://www.youtube.com/watch?v=zPp80YM2v7k

Answer 1

您的格式字符串在 format 中需要两个参数而你只路过一个 ticker作为论据。
如 ticker是一个二元素列表或元组，你可以这样做:

df['{}_{}1d'.format(*ticker)]

否则删除一个大括号:

df['{}_1d'.format(ticker)]