Python 使用copy()后设置WithCopyWarning

Python 使用copy()后设置WithCopyWarning,python,pandas,copy,Python,Pandas,Copy,我有如下代码 import pandas as pd import numpy as np data = [['Alex',10,5,0],['Bob',12,4,1],['Clarke',13,6,0],['brke',15,1,0]] df = pd.DataFrame(data,columns=['Name','Age','weight','class'],dtype=float) df_numeric=df.select_dtypes(include='number')#, excl

我有如下代码

import pandas as pd
import numpy as np
data = [['Alex',10,5,0],['Bob',12,4,1],['Clarke',13,6,0],['brke',15,1,0]]
df = pd.DataFrame(data,columns=['Name','Age','weight','class'],dtype=float) 

df_numeric=df.select_dtypes(include='number')#, exclude=None)[source]
df_non_numeric=df.select_dtypes(exclude='number')

df_non_numeric['class']=df_numeric['class'].copy()
它给了我以下的信息

__main__:1: SettingWithCopyWarning: 
A value is trying to be set on a copy of a slice from a DataFrame.
Try using .loc[row_indexer,col_indexer] = value instead

See the caveats in the documentation: http://pandas.pydata.org/pandas-docs/stable/indexing.html#indexing-view-versus-copy
我想拥有独立于
df\u numeric
df\u non\u numeric

根据其他帖子中给出的建议,我使用了
df_numeric['class'].copy()


我怎样才能避免该消息?

我认为您需要
复制
,因为是按列类型筛选的切片操作,请检查:

如果稍后修改
df\u non\u numeric
中的值,您将发现修改不会传播回原始数据(
df
),并且不会发出警告

df_numeric=df.select_dtypes(include='number').copy()
df_non_numeric=df.select_dtypes(exclude='number').copy()