为什么python不允许我删除文件?

我创建了一个python脚本,它从一个文本文件中获取一个文件列表,并在文件为空时将其删除。它正确地检测到空文件,但不想删除它们。它给了我:

(32, 'The process cannot access the file because it is being used by another process')

我使用了两种不同的工具来检查文件是否被锁定,我确信它们不是。我使用了SysInternals Process Explorer和LockHunter。此外,我可以自己手动删除文件。我显然不想为他们所有人都这样做,因为在不同的地方有数百个。

剧本:

import os.path
import sys

def DeleteFilesFromListIfBlank(PathToListOfFiles):
    ListOfFiles = open(PathToListOfFiles)
    FilesToCheck = [];
    for line in ListOfFiles.readlines():
        if(len(line) > 1):
            line = line.rstrip();
            FilesToCheck.append(line)
    print "Found %s files to check.  Starting check." % len(FilesToCheck)

    FilesToRemove = [];
    for line in FilesToCheck:        
        #print "Opening %s" % line
        try:
            ActiveFile = open(line);
            Length = len(ActiveFile.read())
            if(Length < 691 and ActiveFile.read() == ""):
                print "Deleting %s" % line
                os.unlink(line);
            else:
                print "Keeping %s" % line
        except IOError,message:
            print "Could not open file: $s" % message
        except Exception as inst:
            print inst.args

DeleteFilesFromListIfBlank("C:\\ListOfResx.txt")

我尝试同时使用os.unlink和os.remove。我在vista64上运行python 2.6

谢谢