Question

如果我正确地做这个部分，请告诉我。我试图抓取过去24小时内仅修改过的文件。但是，无论修改时间如何，我的输出都是目录中的所有文件：

yesterday = date.today() - timedelta(days=1)
dayToStr = yesterday.strftime('%Y%m%d')

file_list_attr = sftp.listdir_attr()
for file in file_list_attr:
  if  file.st_mtime <= dayToStr:
    print file

输出

-rw-r - r-- 1 4012 60 3404961 09 Jan 18:32 2_YEAR_912828UD0_20130109.dat       -rw-r - r-- 1 4012 60 10206411 09 Jan 18:32 3_YEAR_912828UG3_20130109.dat       -rw-r - r-- 1 4012 60 68311760 09 Jan 18:34 5_YEAR_912828UE8_20130109.dat       -rw-r - r-- 1 4012 60 54215712 09 Jan 18:35 7_YEAR_912828UF5_20130109.dat       -rw-r - r-- 1 4012 60 88014103 09 Jan 18:37 10_YEAR_912828TY6_20130109.dat       -rw-r - r-- 1 4012 60 53565072 09 Jan 18:38 30_YEAR_912810QY7_20130109.dat       -rw-r - r-- 1 4012 60 8527412 04 Jan 18:31 2_YEAR_912828UD0_20130104.dat       -rw-r - r-- 1 4012 60 21659138 04 Jan 18:31 3_YEAR_912828UC2_20130104.dat       -rw-r - r-- 1 4012 60 91281894 04 Jan 18:34 5_YEAR_912828UE8_20130104.dat       -rw-r - r-- 1 4012 60 80421507 04 Jan 18:36 7_YEAR_912828UF5_20130104.dat       -rw-r - r-- 1 4012 60 108700356 04 Jan 18:38 10_YEAR_912828TY6_20130104.dat       -rw-r - r-- 1 4012 60 50204292 04 Jan 18:39 30_YEAR_912810QY7_20130104.dat       -rw-r - r-- 1 4012 60 2319656 07 Jan 18:24 2_YEAR_912828UD0_20130107.dat       -rw-r - r-- 1 4012 60 6978760 07 Jan 18:24 3_YEAR_912828UC2_20130107.dat       -rw-r - r-- 1 4012 60 53579177 07 Jan 18:25 5_YEAR_912828UE8_20130107.dat       -rw-r - r-- 1 4012 60 46069381 07 Jan 18:26 7_YEAR_912828UF5_20130107.dat       -rw-r - r-- 1 4012 60 70802355 07 Jan 18:28 10_YEAR_912828TY6_20130107.dat       -rw-r - r-- 1 4012 60 43050822 07 Jan 18:29 30_YEAR_912810QY7_20130107.dat       -rw-r - r-- 1 4012 60 2713906 08 Jan 18:31 2_YEAR_912828UD0_20130108.dat       -rw-r - r-- 1 4012 60 8889264 08 Jan 18:31 3_YEAR_912828UC2_20130108.dat       -rw-r - r-- 1 4012 60 63857903 08 Jan 18:32 5_YEAR_912828UE8_20130108.dat       -rw-r - r-- 1 4012 60 55544096 08 Jan 18:34 7_YEAR_912828UF5_20130108.dat       -rw-r - r-- 1 4012 60 89750161 08 Jan 18:36 10_YEAR_912828TY6_20130108.dat       -rw-r - r-- 1 4012 60 59233399 08 Jan 18:37 30_YEAR_912810QY7_20130108.dat

Answer 1

file.st_mtime是整数时间戳。 dayToStr是一个字符串。

在Python2中，integers 总是比较strings，而i来自int之前的s。 {1}} str按字母顺序排列：

In [123]: 1234 < 'foobar'
Out[123]: True

在Python3中，将int与str进行比较会引发TypeError：

>>> 1234 < 'foobar'
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unorderable types: int() < str()

相反，比较日期时间对象：

import datetime as DT
import os

yesterday = DT.datetime.now() - DT.timedelta(days=1)
# or, if you want 00:00 AM, yesterday:
# yesterday = DT.datetime.now().replace(hour = 0, minute = 0, second = 0, microsecond = 0) - DT.timedelta(days=1)

file_list_attr = sftp.listdir_attr()
for pfile in file_list_attr:
    if DT.datetime.fromtimestamp(pfile.st_mtime) > yesterday:
        print pfile

参考文献：

arbitrary reason：这用于将时间戳转换为DT.datetime对象。
datetime.fromtimestamp：建议将小时，分钟，秒（yesterday）设置为零。

Answer 2

与'昨天'比较时似乎失败

for pfile in file_list_attr:
    print DT.datetime.fromtimestamp(pfile.st_mtime)


2013-01-09 18:32:06
2013-01-09 18:32:22
2013-01-09 18:34:07
2013-01-09 18:35:27
2013-01-09 18:37:38

for pfile in file_list_attr:
    print DT.datetime.fromtimestamp(pfile.st_mtime) > yesterday



Traceback (most recent call last):
  File "<pyshell#41>", line 2, in <module>
    print DT.datetime.fromtimestamp(pfile.st_mtime) > yesterday
TypeError: can't compare datetime.datetime to datetime.date

Answer 3

这是一个如何做的例子：

打印所有符合24小时前修改过的条件的文件

    # Task: grab files ONLY modified in the past 24 hours

    import os
    import datetime

    myPath = "/users/george/documents/"

    # Adding all the files found in myFolder in a collection
    fileCollection = os.listdir(myPath)

    # Iterating through the files, printing their last modified date
    for i in fileCollection:
        # Getting the timestamp in a variable
        fileModTimeStamp = os.path.getmtime(myPath + str(i))
        fileModDateTime = datetime.datetime.fromtimestamp(fileModTimeStamp)

        # Calculating the time delta
        currentTime = datetime.datetime.now()
        timeElapsed =  currentTime - fileModDateTime

        # 24h dimedelta
        twentyFourHours = datetime.datetime(1900, 1, 2, 0, 0, 0, 0) -  datetime.datetime(1900, 1, 1, 0, 0, 0, 0)

        # Print the files that meet the condition
        if timeElapsed <= twentyFourHours:
            print "The File: " + str(i) + " Was Last Modified At: " + str(fileModDateTime) + " ,Which was about: " \
              + str(timeElapsed) + " ago."

Answer 4

我不相信os模块会工作，因为我使用paramiko来SFTP到远程主机并对目录中的文件执行操作

for filename in file_list_attr:
    mtime = os.path.getmtime(filename)
    print mtime



Traceback (most recent call last):
  File "<pyshell#22>", line 2, in <module>
    mtime = os.path.getmtime(filename)
  File "U:\ActivPy\lib\genericpath.py", line 54, in getmtime
    return os.stat(filename).st_mtime
TypeError: coercing to Unicode: need string or buffer, SFTPAttributes found

Python timedelta

4 个答案: