python按修改的时间过滤文件 [英] python filter files by modified time

问题描述

我有以下代码:

def filter_by_time(files):
    print "---List of log files to timecheck: "
    for f in files:
        print f, datetime.datetime.fromtimestamp(os.path.getmtime(f))
    print "------"

    mins = datetime.timedelta(minutes=int(raw_input("Age of log files in minutes? ")))
    print "Taking ", mins, "minutes"
    mins = mins.total_seconds()
    current = time.time()
    difftime = current - mins
    print "current time: ", datetime.datetime.fromtimestamp(current)
    print "logs from after: ", datetime.datetime.fromtimestamp(difftime)   

    for f in files:    
        tLog = os.path.getmtime(f)
        print "checking ", f, datetime.datetime.fromtimestamp(tLog)
        if difftime > tLog:
            print "difftime is bigger than tLog", "removing ", f
            files.remove(f)

    print "*****List of log files after timecheck"
    for f in files:
        print f, datetime.datetime.fromtimestamp(os.path.getmtime(f)) 
    print "******"  
    return files

以及一些示例日志文件.输入几分钟后，以上代码的输出为:

And a sample number of log files. The output of the above code when I enter a few minutes is:

List of log files to timecheck: 

1copy2.log  11:59:40

1copy3.log  12:13:53

1copy.log  11:59:40

1.log  11:59:40

Age of log files in minutes? 5

Taking  0:05:00 minutes

current time:  2015-07-14 14:02:11.861755

logs from after:  2015-07-14 13:57:11.861755

checking  1 copy 2.log 2015-07-14 11:59:40

difftime is bigger than tLog removing  1copy2.log

checking  1copy.log 2015-07-14 11:59:40

difftime is bigger than tLog removing  1copy.log

List of log files after timecheck



1copy3.log 2015-07-14 12:13:53

1.log 2015-07-14 11:59:40



Collected: 1copy3.log

Collected: 1.log

您可以看到它收集的文件不正确.它正在做的是检查4个文件，以查看是否在最近5分钟内对其进行了修改.它从列表中删除了2个，但应该已经删除了4个文件.

As you can see the files it has collected are not correct. What its doing is checking the 4 files to see if any were modified in the last 5 mins. It removes 2 from the list but should have removed the 4 files.

(进行一些编辑以使其更易于阅读)

(Made some edits to make easier to read)

推荐答案

在迭代列表时，您将从列表中删除项目.结果是不可预测的.

You are removing items from the list while you are iterating the list. The result is unpredictable.

尝试遍历列表的副本，如下所示:

Try iterating over a copy of the list like so:

for f in files[:]:    # Note the [:] after "files"
    tLog = os.path.getmtime(f)
    print "checking ", f, datetime.datetime.fromtimestamp(tLog)
    if difftime > tLog:
        print "difftime is bigger than tLog", "removing ", f
        files.remove(f)

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