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mark_is_model_col_name_in_excel="is_model"
feature_cols=['duration_group', 'altitude_level', 'chronic_heart_failure'] # 要选取的列
X = df.loc[df[mark_is_model_col_name_in_excel]==1, feature_cols] 
# 行:仅选取is_model列的值==1的行
# 列:feature_cols

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