так, ребята, наконец, я сделал это с помощью следующего кода. Хотя я добавил список столбцов вручную и все еще находил способ, которым я мог бы динамически выдавать этот список столбцов.
import pandas as pd
import numpy as np
import warnings
warnings.filterwarnings('ignore')
avclient_workbook ="File1.xlsx"
cmdb_workbook = "File2.xlsx"
output_workbook = "File3.xlsx"
df_avclient_workbook = pd.read_excel(avclient_workbook)
df_cmdb_workbook = pd.read_excel(cmdb_workbook)
merged_dataset = pd.merge(df_avclient_workbook, df_cmdb_workbook, how='left',
left_on='Computer name',
right_on='short')
final_dataset = merged_dataset[df_avclient_workbook.columns]
final_dataset['CMDB crosscheck'] = merged_dataset['short']
#list of column names which i want to populate
final_dataset = final_dataset[["Computer name","CMDB crosscheck","Computer DNS name","IP address","User account","Management server","Group name","Vendor","Product name","Product version","FW policy","Definition version","Server definition","Delta time","Definition date","Delta range","Last connection (UTC)","Last connection range","Last AD connection","AV status","FW status","IPS status","ATP status","Agent GUID","Agent version","Scan engine","FW version","Hotfixes","OS name","OS version","Platform","Platform type","Architecture","Group path","Cloud / infra","Management proxy","Management proxy IP","ITSM name","ITSM priority","ITSM install status","ITSM responsible group","Tags","Excluded tags","Tree sorting","Last update (UTC)","Problem found","Problem description"]]
final_dataset.to_excel(output_workbook, index=False)
#writer.save()