我有两列 newlabels 和 newlabels_tobeReplaced 。 如果 newlabels 的句子中包含单词 ‘trifurcation’ ，则 newlabels_tobeReplaced 应替换为 ‘trifurcation’ 我有以下代码

df_new.loc[df_new.newlabels.str.contains('trifurcation'),'newlabels_tobeReplaced'] = 'trifurcation'

但是，我收到了这个错误：

A value is trying to be set on a copy of a slice from a DataFrame.
Try using .loc[row_indexer,col_indexer] = value instead

See the caveats in the documentation: http://pandas.pydata.org/pandas-docs/stable/indexing.html#indexing-view-versus-copy
self.obj[item] = s

任何想法，如何获得正确的结果。