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我想切片在熊貓數據框,並將其保存到另一個數據框。假設df
是一個現有的數據框,我想將它的某個部分分成df1
。但是,我得到這樣的警告:熊貓設置與複製警告
/usr/local/lib/python3.5/dist-packages/ipykernel_launcher.py:25: SettingWithCopyWarning:
A value is trying to be set on a copy of a slice from a DataFrame
我在SO討論類似的問題,檢查各崗位(其中兩個以下):
通過這些鏈接,我是ab樂找到下面的行
Years=['2010','2011']
for key in Years:
df1['GG'][key]=df[key][df[key].Consumption_Category=='GG']
,我再改爲以下
Years=['2010','2011']
for key in Years:
df1['GG'][key]=df[key].loc[df['2010'].iloc[:,0]=='GG']
和逃脫警告問題。
但是,當我包含另一行從此數據框中刪除某一列時,我再次發出警告,我無法排除。
Years=['2010','2011']
for key in Years:
df1['GG'][key]=df[key].loc[df['2010'].iloc[:,0]=='GG']
df1['GG'][key]=df1['GG'][key].drop(['Consumption_Category'],axis=1,inplace=True)