python - 使os.walk/os.stat忽略权限被拒绝？

Question

我制作了下面的Python 2.4脚本，该脚本扫描了许多LINUX磁盘上的文件，并以易于阅读的格式从os.stat返回了它们的路径和状态。

#!/usr/bin/env python

from datetime import datetime as dt
import os
import grp
import pwd

locations = ["/disk1", "/disk2", "/disk3", "/disk4", "/disk5", "/disk6"]

for item in locations:
    for root, dirs, files in os.walk(item):
        for fn in files:
            path = os.path.join(root, fn)
            stats = os.lstat(path)
            size = str(stats.st_size)
            user = pwd.getpwuid(stats.st_uid)[0]
            group = grp.getgrgid(stats.st_gid)[0]
            laccess = dt.fromtimestamp(stats.st_atime).strftime("%Y-%m-%d,%H:%M:%S")
            lmod = dt.fromtimestamp(stats.st_mtime).strftime("%Y-%m-%d,%H:%M:%S")
            c = ","
            t1 = ["0,", path, c, size, c, user, c, group, c, laccess, c, lmod,"\n"]
            outfile = open("/data/promigrate/DiskDashboard/Temp/filescan.csv", "at")
            outfile.write("".join(t1))
            outfile.close()

但是，我发现我无权访问系统上的某些文件。

我收到以下错误:

abc12bmm -34> python files_scan.py
Traceback (most recent call last):
    File "files_scan.py", line 24, in ?
        stats = os.lstat(path)
OSError: [Errno 13] Permission denied: '/disk1/file5'

是否可以通过以下方式处理错误:该过程跳过权限被拒绝的错误并继续到下一个文件？

我一直在玩异常等游戏，但是没有喜悦，所以任何帮助将不胜感激。

谢谢!

贾斯汀

Answer 1

问题是由于os.lstat没有权限在文件上运行，我在错误的位置使用了try-except。要处理该错误，请尝试添加try和except，如下所示。

#!/usr/bin/env python

from datetime import datetime as dt
import os
import grp
import pwd

locations = ["/disk1", "/disk2", "/disk3", "/disk4", "/disk5", "/disk6"]

for item in locations:
    for root, dirs, files in os.walk(item):
        for fn in files:
            path = os.path.join(root, fn)
            try:
                stats = os.lstat(path)
                size = str(stats.st_size)
                user = pwd.getpwuid(stats.st_uid)[0]
                group = grp.getgrgid(stats.st_gid)[0]
                laccess = dt.fromtimestamp(stats.st_atime).strftime("%Y-%m-%d,%H:%M:%S")
                lmod = dt.fromtimestamp(stats.st_mtime).strftime("%Y-%m-%d,%H:%M:%S")
                c = ","
                t1 = ["0,", path, c, size, c, user, c, group, c, laccess, c, lmod,"\n"]
                outfile = open("/data/promigrate/DiskDashboard/Temp/filescan.csv", "at")
                outfile.write("".join(t1))
                outfile.close()
            except OSError:
                pass

现在可以处理该错误并继续运行。

感谢你的帮助!