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python - 数据帧警告 : SettingWithCopyWarning in python

转载 作者:太空宇宙 更新时间:2023-11-04 05:09:33 25 4
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<分区>

正在处理来自
的文件 http://portal.amfiindia.com/spages/NAV0.txt
得到如下输出:
31012017,1,1,135765,12,10.8536000,
31012017,1,1,135762,12,10.8543000,
31012017,1,1,135760,12,10.6599000,
31012017,1,1,135759,12,10.6554000,
31012017,1,1,135763,12,10.8536000,
..
..
..

我试过使用下面的代码但得到了以下警告。

代码:

import pandas
import numpy as np

#Sample file for NAV0.txt can be downloaded from url: http://portal.amfiindia.com/spages/NAV0.txt
#creating pandas with selected columns
df=pandas.read_table('NAV0.txt',sep=';',usecols=['Date','Scheme Code','Net Asset Value'])

#converting column with name 'Scheme Code' to digit to remove string part
fil_df=df[df['Scheme Code'].apply(lambda x : str(x).isdigit())]

#converting column with name 'Net Asset value' to numberic and set each value with 7 decimal places
fil_df['Net Asset Value']=pandas.to_numeric(fil_df['Net Asset Value'],errors='coerce')
fil_df['Net Asset Value']=fil_df['Net Asset Value'].map(lambda x: '%2.7f' % x)


#Formating Date column as YYYMMDD
fil_df['Date']=pandas.to_datetime(fil_df['Date']).dt.strftime('%d%m%Y')

#adding extra column in dataframe
fil_df['ser1']=1
fil_df['ser2']=1
fil_df['period']=12
fil_df['lcol']=''
fil_df=fil_df[['Date','ser1','ser2','Scheme Code','period','Net Asset Value','lcol']]

#Converting datafile to csv
fil_df.to_csv('NAV_1.csv',index=False,header=None)
fil_df.dtypes

错误:

c:\users\administrator\appdata\local\programs\python\python35-32\lib\site-packages\ipykernel__main__.py:12: 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

c:\users\administrator\appdata\local\programs\python\python35-32\lib\site-packages\ipykernel__main__.py:13: 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

c:\users\administrator\appdata\local\programs\python\python35-32\lib\site-packages\ipykernel__main__.py:17: 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

c:\users\administrator\appdata\local\programs\python\python35-32\lib\site-packages\ipykernel__main__.py:20: 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

c:\users\administrator\appdata\local\programs\python\python35-32\lib\site-packages\ipykernel__main__.py:21: 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

c:\users\administrator\appdata\local\programs\python\python35-32\lib\site-packages\ipykernel__main__.py:22: 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

c:\users\administrator\appdata\local\programs\python\python35-32\lib\site-packages\ipykernel__main__.py:23: 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

Csv 文件正在按预期生成,但我该如何克服此警告?我试过使用
fil_df.loc[ pandas.to_numeric(fil_df['Net Asset Value'],errors='coerce').map(lambda x: '%2.7f' % x]
但它没有帮助。
帮助将不胜感激。

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