Python Pandas 数据处理：提取西瓜数据集 '密度' 和 '含糖量' 特征

import pandas as pd xigua40 = pd.read_csv('example.csv',index_col=0) x = xigua40[['密度','含糖量']].values x = array([[0.697, 0.46 ], [0.774, 0.376], [0.634, 0.264], [0.608, 0.318], [0.556, 0.215], [0.403, 0.237], [0.481, 0.149], [0.437, 0.211], [0.666, 0.091], [0.243, 0.267], [0.245, 0.057], [0.343, 0.099], [0.639, 0.161], [0.657, 0.198], [0.36 , 0.37 ], [0.593, 0.042], [0.719, 0.103], [0.359, 0.188], [0.339, 0.241], [0.282, 0.257], [0.748, 0.232], [0.714, 0.346], [0.483, 0.312], [0.478, 0.437], [0.525, 0.369], [0.751, 0.489], [0.532, 0.472], [0.473, 0.376], [0.725, 0.445], [0.446, 0.459]])