如何使用re.sub实际替换文件名？

Question

我把使用mac程序Patterns的正则表达式放在一起，当我在我的python脚本中使用代码时，我无法获取对文件名所做的更改。我知道你需要将re.sub的输出分配给一个新的字符串，这是一个常见的错误。我这样做了，但仍然无法获得正确的结果。

这里是我的代码与给定文件名称输入：

real.time.With.bill.maher.JUST.OVERTIME.2014.01.31.WEB-DL.Shadoe

real time with bill maher 2014 01 24 hdtv x264-2hd.mp4

Real Time With Bill Maher 2014.02.07.hdtv.x264-2hd.mp4

import re 
import os 

path = "/Users/USERNAME/Movies" 
pattern = "(real[. ]time[. ]with[. ]bill[. ]maher[. ])" 
replacement = "Real Time with Bill Maher " 

def renamer(path, pattern, replacement): 
    for dirpath,_,file in os.walk(path): 
     for oldname in file: 
      if re.search(pattern, oldname, re.I): 
       newname = re.sub(pattern, replacement, oldname) 
       newpath = os.path.join(dirpath, newname) 
       oldpath = dirpath + "/" + oldname 
       print newpath + " < new" 
       print oldpath 
       os.rename(oldpath, newpath) 

renamer(path, pattern, replacement) 

Answer 1

代码缺少re.I标志re.sub电话：

>>> pattern = "(real[. ]time[. ]with[. ]bill[. ]maher[. ])" 
>>> replacement = "Real Time with Bill Maher " 
>>> re.sub(pattern, replacement, 'real.time.With.bill.maher.JUST.OVERTIME.2014.01.31.WEB-DL.Shadoe') 
'real.time.With.bill.maher.JUST.OVERTIME.2014.01.31.WEB-DL.Shadoe' 
>>> re.sub(pattern, replacement, 'real.time.With.bill.maher.JUST.OVERTIME.2014.01.31.WEB-DL.Shadoe', flags=re.I) 
'Real Time with Bill Maher JUST.OVERTIME.2014.01.31.WEB-DL.Shadoe' 

您应该指定flags作为关键字参数，否则它将被识别为count（replace count）参数。