Python-jupyter环境下报错 Passing list-likes to .loc or [] with any missing labels is no longer supported

研究git上的一个abu量化源码是复现时发现的bug，因为是3~4年前的源码和教程，兼容性上会有问题，按照步骤复现时报错如下：

报错日志如下：

'Passing list-likes to .loc or [] with any missing labels is no longer supported, see https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#deprecate-loc-reindex-listlike'
Traceback (most recent call last):
  File "C:UsersAdminDesktopabu-masterabu-masterabupyAlphaBuABuPickTimeExecute.py", line 117, in _batch_symbols_with_same_factors
    kl_pd = kl_pd_manager.get_pick_time_kl_pd(target_symbol)
  File "C:UsersAdminDesktopabu-masterabu-masterabupyTradeBuABuKLManager.py", line 169, in get_pick_time_kl_pd
    kl_pd = self._fetch_pick_time_kl_pd(target_symbol)
  File "C:UsersAdminDesktopabu-masterabu-masterabupyTradeBuABuKLManager.py", line 157, in _fetch_pick_time_kl_pd
    return ABuSymbolPd.make_kl_df(target_symbol, data_mode=EMarketDataSplitMode.E_DATA_SPLIT_UNDO,
  File "C:UsersAdminDesktopabu-masterabu-masterabupyMarketBuABuSymbolPd.py", line 305, in make_kl_df
    df, _ = _make_kl_df(symbol, data_mode=data_mode,
  File "C:UsersAdminDesktopabu-masterabu-masterabupyMarketBuABuSymbolPd.py", line 128, in _make_kl_df
    df = _benchmark(df, benchmark, temp_symbol)
  File "C:UsersAdminDesktopabu-masterabu-masterabupyMarketBuABuSymbolPd.py", line 53, in _benchmark
    kl_pd = df.loc[benchmark.kl_pd.index]
  File "E:Anaconda3libsite-packagespandascoreindexing.py", line 1768, in __getitem__
    return self._getitem_axis(maybe_callable, axis=axis)
  File "E:Anaconda3libsite-packagespandascoreindexing.py", line 1954, in _getitem_axis
    return self._getitem_iterable(key, axis=axis)
  File "E:Anaconda3libsite-packagespandascoreindexing.py", line 1595, in _getitem_iterable
    keyarr, indexer = self._get_listlike_indexer(key, axis, raise_missing=False)
  File "E:Anaconda3libsite-packagespandascoreindexing.py", line 1552, in _get_listlike_indexer
    self._validate_read_indexer(
  File "E:Anaconda3libsite-packagespandascoreindexing.py", line 1654, in _validate_read_indexer
    raise KeyError(
KeyError: 'Passing list-likes to .loc or [] with any missing labels is no longer supported, see https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#deprecate-loc-reindex-listlike'

 目前使用的是Python3.8版本，报错后一步一步排查，发现是报错中的这个问题

kl_pd = df.loc[benchmark.kl_pd.index]

遂去源码中查找，发现日期及个股问题，个股存在某日停牌的情况，所以在某些日期下是空，使用.loc没法查询到该日期下的数据，会返回报错（新版本）

知道是这个问题就好办了，用了官方文档上的链接查看最新版本的解决方法，即使用.reindex()方法解决，在源码文件  abu-master/abupy/MarketBu/ABuSymbolPd.py 中修改这行代码后可以解决兼容现在版本；

原代码：

kl_pd = df.loc[benchmark.kl_pd.index]

 修改后源码：

kl_pd = df.reindex(benchmark.kl_pd.index)

 再次运行回测相关的脚本，不再报错，完美解决！