我试图让python读取excel文件,然后从.csv文件中创建数据帧,这些文件以excel文件中的行命名,并从.csv文件中索引数据,然后将它们粘贴到excel文件中
excel文件已放入具有以下布局的数据框中:
Name Location Date Check_2 ... Volume VWAP $Volume Trades
0 Orange New York 20200501 X ... NaN NaN NaN NaN
1 Apple Minsk 20200504 X ... NaN NaN NaN NaN
空行应填充从放置在数据框中的.csv文件编制索引的数据,如下所示:
Name Date Time Open High Low Close Volume VWAP Trades
4 Orange 20200501 15:30:00 5.50 5.85 5.45 5.70 1500 5.73 95
5 Orange 20200501 17:00:00 5.65 5.70 5.50 5.60 1600 5.65 54
6 Orange 20200501 20:00:00 5.80 5.85 5.45 5.81 1700 5.73 41
7 Orange 20200501 22:00:00 5.60 5.84 5.45 5.65 1800 5.75 62
8 Orange 20200504 15:30:00 5.40 5.87 5.45 5.75 1900 5.83 84
9 Orange 20200504 17:00:00 5.50 5.75 5.40 5.60 2000 5.72 94
10 Orange 20200504 20:00:00 5.80 5.83 5.44 5.50 2100 5.40 55
11 Orange 20200504 22:00:00 5.40 5.58 5.37 5.80 2200 5.35 87
0 Apple 20200504 15:30:00 3.70 3.97 3.65 3.75 1000 3.60 55
1 Apple 20200504 17:00:00 3.65 3.95 3.50 3.80 1200 3.65 68
2 Apple 20200504 20:00:00 3.50 3.83 3.44 3.60 1300 3.73 71
3 Apple 20200504 22:00:00 3.55 3.58 3.35 3.57 1400 3.78 81
4 Apple 20200505 15:30:00 3.50 3.85 3.45 3.70 1500 3.73 95
5 Apple 20200505 17:00:00 3.65 3.70 3.50 3.60 1600 3.65 54
6 Apple 20200505 20:00:00 3.80 3.85 3.45 3.81 1700 3.73 41
7 Apple 20200505 22:00:00 3.60 3.84 3.45 3.65 1800 3.75 62
我一直在努力填充这些空单元格,因为我无法找到一种方法来正确索引这两个数据帧之间的匹配
例如,尝试:
intradayho = rdf2[(rdf2['Time']=='15:30:00')]
indexopen = pd.DataFrame(intradayho['Open'])
rdf1['Open'] = rdf1.Date.map(intradayho.set_index('Date')['Open'].to_dict())
print("Open prices rdf1")
print(rdf1['Open'])
产生:
Open prices rdf1
0 5.5
1 3.7
但只考虑日期,因此它将复制“日期”列的打开值,而不是“名称”和“日期”,这是一个问题,因为这两个值需要匹配
此外,此代码还会产生以下错误:
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
但是当我试着用
rdf1.loc[rdf1['Open']] = rdf1.Date.map(intradayho.set_index('Date')['Open'].to_dict())
我得到一个错误:
KeyError: "None of [Float64Index([nan, nan], dtype='float64')] are in the [index]"
这对我来说没有意义,因为整个目标是填充这些“NaN”值
这里有人能帮我做一些东西,可以索引匹配这些数据框中的数据并将其写入Excel文件吗
谢谢
编辑: 忘记发布我的完整代码,这是:
import pandas as pd
import os
#Opening 'Test Tracker.xlsx' to find entities to download
TEST = pd.ExcelFile("Trackers\TEST Tracker.xlsx")
df1 = TEST.parse("Entries")
values1 = df1[['Name', 'Location', 'Date', 'Check_2',
'Open', 'High', 'Low', 'Close', 'Volume', 'VWAP', '$Volume',
'Trades']]
#Searching for every row that contains the value 'X' in the column 'Check_2'
rdf1 = values1[values1.Check_2.str.contains("X")]
#Printing dataframe to check
print("First Dataframe")
print(rdf1)
#creating a list for the class objects
Fruits = []
#Generating dataframes from classobjects
for idx, rows in rdf1.iterrows():
fle = os.path.join('Entities', rows.Location, rows.Name, 'TwoHours.csv')
col_list = ['Name', 'Date', 'Time', 'Open', 'High', 'Low', 'Close', 'Volume', 'VWAP', 'Trades']
df3 = pd.read_csv(fle, usecols=col_list, sep=";")
Fruits.append(df3)
rdf2 = pd.concat(Fruits)
print("Printing Full Data Frame")
print(rdf2)
intradayh = rdf2[(rdf2['Time']>'15:30:00') & (rdf2['Time']<'22:00:00')]
intradayho = rdf2[(rdf2['Time']=='15:30:00')]
indexopen = pd.DataFrame(intradayho['Open'])
intradayhc = rdf2[(rdf2['Time']=='22:00:00')]
indexclose = pd.DataFrame(intradayhc['Close'])
rdf1.loc[rdf1['Open']] = rdf1.Date.map(intradayho.set_index('Date')['Open'].to_dict())
print("Open prices rdf1")
print(rdf1['Open'])
编辑:注释中要求的所需输出:
Name Location Date Open High Low close volume VWAP ...
0 Orange New York 20200501 5.5 5.95 5.45 5.65 6600 5.71 ...
1 Apple Minsk 20200504 3.7 3.83 3.35 3.57 4900 3.69 ...
我将在“开放”中进行1:1匹配,“高”中进行最大值匹配,“低”中进行最小值匹配,“关闭”中进行1:1匹配,“交易量”和“交易量”的和值匹配。“VWAP”的平均值和“$Volume”中的“Volume*VWAP”值
df
,您的nan datframe和df2
;包含所有数据的更大数据帧使用
groupby
和.agg()
在多个列上查找多个聚合一种方法是进行内部合并并对更新的列进行切片
或 聚合后,使用
combine_first
并删除所有NaNs
结果
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