為何不考慮用一次讀一行，再用split的對空白做切割，再一一塞入資料結構?

with open(r'data.txt', 'r') as f:
    x = f.readlines()

preProcess = [item.split(']: ') for item in x]
    # 本來切 ": " 發現會切到後面
    # 改切 "]: " 不過如果後面資料不確定用原本的方式應該會比較好
preProcess2 = [[item[0].replace('  ', ' '), item[1]] for item in preProcess]
preProcess3 = [[item[0] + ']', item[1]] for item in preProcess2]
preProcess4 = [item[0].replace(' ', ',') + ',' + item[1] for item in preProcess3]
str=''

with open(r'data.csv', 'w') as f:
    f.write(str.join(preProcess4))
    
print(str.join(preProcess4))
# output
'''
Dec,31,23:59:58,clftp1,ftpd[1739],NLST ASECL_snapshot.xml
Dec,31,23:59:58,clftp1,ftpd[1739],RETR ASECL_snapshot.xml
Dec,31,23:59:58,clftp1,ftpd[139],QUIT
Dec,31,23:59:58,clftp1,ftpd[1739],FTP session closed
Dec,31,23:59:58,clftp1,ftpd[1739],PASV
Dec,31,23:59:59,clftp1,ftpd[1081],TYPE ASCII
Dec,31,23:59:59,clftp1,ftpd[181],QUIT
Dec,31,23:59:59,clftp1,ftpd[1081],FTP session closed
Jan,1,00:00:00,clftp1,ftpd[1740],Data port : 20
Jan,1,00:00:00,clftp1,ftpd[1740],FTP server (Revision 1.1 Version wuftpd-2.6.1(PHNE_40380) Fri Dec  4 10:05:22 GMT 2009) ready.
Jan,1,00:00:00,clftp1,ftpd[1740],SYST
Jan,1,00:00:00,clftp1,ftpd[1740],USER nxp_cp
Jan,1,00:00:00,clftp1,ftpd[1740],PASS password
Jan,1,00:00:00,clftp1,ftpd[1740],FTP LOGIN FROM 10.14.7.24 [10.14.7.24], nxp_cp
Jan,1,00:00:00,clftp1,ftpd[40],TYPE Image
Jan,1,00:00:00,clftp1,ftpd[1740],CWD /nxpcp_quota_check
Jan,1,00:00:00,clftp1,ftpd[1740],PASV
Jan,1,00:00:00,clftp1,ftpd[1743],RETR nxpcp_quota.log
Jan,1,00:00:00,clftp1,ftpd[1740],QUIT
Jan,1,00:00:00,clftp1,ftpd[1740],FTP session closed
'''

使用Regular Expression處理': '

# -*- coding: utf-8 -*-
import re

preProcess =[]
with open(r'Rawdata.txt', 'r') as f:
    for line in f.readlines():
        prestring = re.split(r'(ftpd\[\d+\]): ', line)
        result =  prestring[0].split() + prestring[1:]
        preProcess.append(result)
        print(result)