我正在使用Pandas通过Data Frames存储股价数据。数据集中有2940行。数据集快照显示如下:

python - 在Pandas Dataframe列中填写缺少的日期值-LMLPHP

时间序列数据不包含星期六和星期日的值。因此,必须填写缺失值。
这是我编写的代码,但不能解决问题:

import pandas as pd
import numpy as np
import os
os.chdir('C:/Users/Admin/Analytics/stock-prices')

data  = pd.read_csv('stock-data.csv')

# PriceDate Column - Does not contain Saturday and Sunday stock entries
data['PriceDate'] =  pd.to_datetime(data['PriceDate'], format='%m/%d/%Y')
data = data.sort_index(by=['PriceDate'], ascending=[True])


# Starting date is Aug 25 2004
idx = pd.date_range('08-25-2004',periods=2940,freq='D')


data = data.set_index(idx)
data['newdate']=data.index
newdate=data['newdate'].values   # Create a time series column


data = pd.merge(newdate, data, on='PriceDate', how='outer')

如何填充星期六和星期日的缺失值?

最佳答案

我认为您可以将 resample ffill bfill 一起使用,但是在set_index列中的 PriceDate 之前:

print (data)
   ID  PriceDate  OpenPrice  HighPrice
0   1  6/24/2016          1          2
1   2  6/23/2016          3          4
2   2  6/22/2016          5          6
3   2  6/21/2016          7          8
4   2  6/20/2016          9         10
5   2  6/17/2016         11         12
6   2  6/16/2016         13         14
data['PriceDate'] =  pd.to_datetime(data['PriceDate'], format='%m/%d/%Y')
data = data.sort_values(by=['PriceDate'], ascending=[True])
data.set_index('PriceDate', inplace=True)
print (data)
            ID  OpenPrice  HighPrice
PriceDate
2016-06-16   2         13         14
2016-06-17   2         11         12
2016-06-20   2          9         10
2016-06-21   2          7          8
2016-06-22   2          5          6
2016-06-23   2          3          4
2016-06-24   1          1          2

data = data.resample('D').ffill().reset_index()
print (data)
   PriceDate  ID  OpenPrice  HighPrice
0 2016-06-16   2         13         14
1 2016-06-17   2         11         12
2 2016-06-18   2         11         12
3 2016-06-19   2         11         12
4 2016-06-20   2          9         10
5 2016-06-21   2          7          8
6 2016-06-22   2          5          6
7 2016-06-23   2          3          4
8 2016-06-24   1          1          2
data = data.resample('D').bfill().reset_index()
print (data)
   PriceDate  ID  OpenPrice  HighPrice
0 2016-06-16   2         13         14
1 2016-06-17   2         11         12
2 2016-06-18   2          9         10
3 2016-06-19   2          9         10
4 2016-06-20   2          9         10
5 2016-06-21   2          7          8
6 2016-06-22   2          5          6
7 2016-06-23   2          3          4
8 2016-06-24   1          1          2

关于python - 在Pandas Dataframe列中填写缺少的日期值,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/38361526/

10-09 13:50