FutureWarning

python机器学习实践指南，原书代码：df.groupby('class')['petal width']\.agg({'delta': lambda x :x.max() - x.min(),    'max': np.max,'min':np.min})

运行后报错：FutureWarning: using a dict on a Series for aggregationis deprecated and will be removed in a future version  'max': np.max,'min':np.min})

修改如下：def delta(group):    return max(group) - min(group)df.groupby('class')['petal width'].agg([delta])

运行结果：如下图

详情请参见：http://pandas.pydata.org/pandas-docs/stable/.打不开请越狱

有用的话请给我投票吧，谢谢！！！