将新行添加到现有数据框

Question

我正在尝试将新记录插入数据框并收到此错误 - DataFrame constructor not Properly called。

这是我的代码，

import pandas as pd

#defining the dataframe
dfHeader = { 'Name': [], 'Daily': [],'Weekly': [],'Monthly': [],'Yearly': [],
             'Area': [], 'Latitude':[] , 'Longitude':[] ,'Amenity': [] }

dFrame = pd.DataFrame(dfHeader)
print(dFrame)
Name = "NA"
DailyPrice = "NA"
WeeklyPrice = "NA"
MonthlyPrice = "NA"
YearlyPrice = "NA"
Area = "NA"
latitude = "NA"
longitude = "NA"
Amenity = "NA"

row = (Name, DailyPrice, WeeklyPrice, MonthlyPrice, YearlyPrice, Area, latitude, longitude, Amenity)

print(row)

dFrame = dFrame.append(pd.DataFrame(row))

请帮助我。

Answer 1

如果您需要添加一行：

In [136]: dFrame.loc[len(dFrame)] = row

In [137]: dFrame
Out[137]:
  Amenity Area Daily Latitude Longitude Monthly Name Weekly Yearly
0      NA   NA    NA       NA        NA      NA   NA     NA     NA

注意：通常它会更好，更快，更少内存消耗（这取决于......）先将数据收集到列表列表中，然后再调用pd.DataFrame()构造函数 /强>：

In [138]: data = [row, np.arange(9)]

In [139]: cols = 'Amenity Area Daily Latitude Longitude Monthly Name Weekly Yearly'.split()

In [140]: df = pd.DataFrame(data, columns=cols)

In [141]: df
Out[141]:
  Amenity Area Daily Latitude Longitude Monthly Name Weekly Yearly
0      NA   NA    NA       NA        NA      NA   NA     NA     NA
1       0    1     2        3         4       5    6      7      8

Answer 2

您无法从元组创建DataFrame。但是，您可以从元组创建Series，并将标记设为dFrame的列：

dFrame.append(pd.Series(row, index=dfHeader.keys()), ignore_index=True)