如何在python3.x csv模块功能中将数据拆分为一列并将值存储在新列中

我正在尝试分割一列中存在的数据并将其存储到一个新的列中。

**Inputdata.csv**
Braund, Mr. Owen Harris ,1
Heikkinen, Miss. Laina ,0
Allen, Mr. William Henry ,0
**Expecting_output.csv**
Braund,Owen Harris ,1,Mr
Heikkinen,Laina ,0,Miss
Allen,William Henry ,0,Mr

我已经尝试并获得了查找和替换功能,但无法对查找进行编码并将其存储到新列中

import csv
print(dir(csv))
filename = "H:\\FairDealCustomerData.csv"
csvout = "H:\\FairDealCustomerDataOUT.csv"
with open(filename,"r",newline='') as file:
     file = ''.join([i for i in file]).replace("Mr.", "")
     file = ''.join([i for i in file]).replace("Miss.", "")
     file = ''.join([i for i in file]).replace("Mrs.", "")
with open(csvout,"w",newline='') as outfile:
     outfile.writelines(file)
     outfile.close()

Inputdata.csv
Braund, Mr. Owen Harris ,1
Heikkinen, Miss. Laina ,0
Allen, Mr. William Henry ,0
 Expecting_output.csv
Braund,Owen Harris ,1,Mr
Heikkinen,Laina ,0,Miss
Allen,William Henry ,0,Mr