#找到一列中分类数据种类少于10并且dtype类型是object的
low_cardinality_cols = [cname for cname in candidate_train_predictors.columns if
candidate_train_predictors[cname].nunique() < 10 and
candidate_train_predictors[cname].dtype == "object"]
原文:https://www.cnblogs.com/wangzhonghan/p/10454761.html