1、python机器学习实践指南，原书代码：df.groupby('class')['petal width']\.agg({'de造婷用痃lta': lambda x :x.max() - x.min(), 'max': np.max,'min':np.min})
2、运行后报错：FutureWarning: using a dict on a Series for aggregationis deprecated and will be remove颊俄岿髭d in a future version 'max': np.max,'min':np.min})
3、修改如下：def delta(group): return max(group) - min(group)df.groupby('class')['petal width'].agg([delta])
4、运行结果：如下图
5、详情请参见：http://pandas.pydata.org/pandas-docs/stable/.打不开请越狱
6、有用的话请给我投票吧，谢谢！！！
