Python – 为Pandas DataFrame添加零列

要为Pandas DataFrame添加零列，请使用方括号将其设置为0。首先，导入所需的库 –

import pandas as pd

创建一个带有3列的DataFrame –

dataFrame = pd.DataFrame(
   {
      "Student": ['Jack', 'Robin', 'Ted', 'Marc', 'Scarlett', 'Kat', 'John'],"Result": ['Pass', 'Fail', 'Pass', 'Fail', 'Pass', 'Pass', 'Pass'],"Roll Number": [ 5, 10, 3, 8, 2, 9, 6]
   }
)

创建新列并将其初始化为0 –

dataFrame['ZeroColumn'] = 0

示例

以下是代码 –

import pandas as pd

# 创建DataFrame
dataFrame = pd.DataFrame(
   {
      "Student": ['Jack', 'Robin', 'Ted', 'Marc', 'Scarlett', 'Kat', 'John'],"Result": ['Pass', 'Fail', 'Pass', 'Fail', 'Pass', 'Pass', 'Pass'],"Roll Number": [ 5, 10, 3, 8, 2, 9, 6]
   }
)

print"DataFrame ...\n",dataFrame

dataFrame['ZeroColumn'] = 0

print"\nUpdated DataFrame ...\n",dataFrame

输出

这将产生以下输出 –

DataFrame ...
   Result   Roll Number   Student
0    Pass             5      Jack
1    Fail            10     Robin
2    Pass             3       Ted
3    Fail             8      Marc
4    Pass             2  Scarlett
5    Pass             9       Kat
6    Pass             6      John

Updated DataFrame ...
   Result   Roll Number   Student   ZeroColumn
0    Pass             5      Jack            0
1    Fail            10     Robin            0
2    Pass             3       Ted            0
3    Fail             8      Marc            0
4    Pass             2  Scarlett            0
5    Pass             9       Kat            0
6    Pass             6      John            0