将列添加到具有恒定值的数据框 [英] Add column to dataframe with constant value

问题描述

我有一个现有的数据框，我需要添加一个额外的列，每行包含相同的值。

I have an existing dataframe which I need to add an additional column to which will contain the same value for every row.

现有df：

Date, Open, High, Low, Close
01-01-2015, 565, 600, 400, 450

新df：

Name, Date, Open, High, Low, Close
abc, 01-01-2015, 565, 600, 400, 450

我知道如何附加现有的系列/数据框列。但这是另一种情况，因为我需要添加名称列并将每个行设置为相同的值，在本例中为 abc。

I know how to append an existing series / dataframe column. But this is a different situation, because all I need is to add the 'Name' column and set every row to the same value, in this case 'abc'.

推荐答案

df ['Name'] ='abc'将添加新列并将所有行设置为该值：

df['Name']='abc' will add the new column and set all rows to that value:

In [79]:

df
Out[79]:
         Date, Open, High,  Low,  Close
0  01-01-2015,  565,  600,  400,    450
In [80]:

df['Name'] = 'abc'
df
Out[80]:
         Date, Open, High,  Low,  Close Name
0  01-01-2015,  565,  600,  400,    450  abc

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