1.從一個檔案中讀取內容（比如有3列內容），然後再新增加2列欄位，並存放在列表中（一共5列）。

2.開啟一個新的檔案，迴圈包含有5列表欄位的列表，並將內容寫進新的檔案。

import random

def writecChannelIdFile(fp, writeFile):
    channel_ids = {'125002805': "135379412029940069", '125102805': "287200733847731473"}  # 125002805：微信 125102805：支付寶
    channel_id = ['125002805', '125102805']
    with open(fp, 
 
"r") as ff:
        myReadFile = ff.readlines()
        orderList = []
        for line in myReadFile:
            channel_id_choice = random.choice(channel_id)  #隨機取列表的內容（一定要放在for迴圈裡面）

            newLine = line.replace("\n", ",")+channel_id_choice +"," + channel_ids[channel_id_choice]
            
 
print(newLine)
            orderList.append(newLine)

    with open(writeFile, 'w')as wf:
        for order in orderList:
            print(order)
            wf.write(order+"\n")

if __name__ == "__main__":
    fp = r"D:\xxx\xxx\xxx\a.txt"            #讀取該路徑下的a.txt檔案
    writeFile = r"D:\xxx\xxx\xxx\b.txt
 
"     #會在該路徑下生成一個b.txt的檔案
    writecChannelIdFile(fp, writeFile)