Question

我有以下代码，我试图检查目录“Gerrits / HEAD / wlan”，然后做一些操作，由于某种原因，如果检查目录的条件仍然失败，即使目录存在？ if条件@ if（os.path.isdir（SCRIPT_ROOT +“/ Gerrits / HEAD / wlan”））有什么问题：下面

import os
import subprocess
from subprocess import check_call

SCRIPT_ROOT=subprocess.Popen(['pwd'], stdout=subprocess.PIPE).communicate()[0]
print SCRIPT_ROOT

def main ():
    if (os.path.isdir(SCRIPT_ROOT + "/Gerrits/HEAD/wlan")):
        print "SCRIPT_ROOT/Gerrits/HEAD/wlan already exists,cloning it again to the tip"
        check_call("rm -rf $SCRIPT_ROOT/Gerrits/HEAD/wlan ", shell=True)
        check_call("cd Gerrits/HEAD",shell=True)
    else:
        print "SCRIPT_ROOT/Gerrits/HEAD/wlan doesn't exist,cloning it"
        os.makedirs("Gerrits/HEAD/wlan")
        check_call("cd Gerrits/HEAD",shell=True)
        currdir=subprocess.Popen(['pwd'], stdout=subprocess.PIPE).communicate()[0]

if __name__ == '__main__':
    main()

错误： -

SCRIPT_ROOT/Gerrits/HEAD/wlan doesn't exist,cloning it
Traceback (most recent call last):
  File "test.py", line 21, in <module>
    main()
  File "test.py", line 16, in main
    os.makedirs("Gerrits/HEAD/wlan")
  File "/usr/lib/python2.6/os.py", line 157, in makedirs
    mkdir(name, mode)
OSError: [Errno 17] File exists: 'Gerrits/HEAD/wlan'

Answer 1

将.strip()添加到您的communicate()[0]来电，代码原样包括输出中的尾随换行符。

只是为了确定，我刚刚使用Python 2.5在Linux机器上测试过你的脚本。

import os
import subprocess
from subprocess import check_call

SCRIPT_ROOT=subprocess.Popen(['pwd'], stdout=subprocess.PIPE).communicate()[0].strip()
print SCRIPT_ROOT

def main ():
    if (os.path.isdir(SCRIPT_ROOT + "/Gerrits/HEAD/wlan")):
        print "SCRIPT_ROOT/Gerrits/HEAD/wlan already exists,cloning it again to the tip"
        check_call("rm -rf %s/Gerrits/HEAD/wlan" % SCRIPT_ROOT, shell=True)
        check_call("cd Gerrits/HEAD",shell=True)
    else:
        print "SCRIPT_ROOT/Gerrits/HEAD/wlan doesn't exist,cloning it"
        os.makedirs("Gerrits/HEAD/wlan")
        check_call("cd Gerrits/HEAD",shell=True)
        currdir=subprocess.Popen(['pwd'], stdout=subprocess.PIPE).communicate()[0].strip()

if __name__ == '__main__':
    main()

及其输出：

vlazarenko@xx:~$ python o.py 
/media/home/vlazarenko
SCRIPT_ROOT/Gerrits/HEAD/wlan already exists,cloning it again to the tip

Answer 2

当我在这里执行这行代码时：

SCRIPT_ROOT=subprocess.Popen(['pwd'], stdout=subprocess.PIPE).communicate()[0]

... SCRIPT_ROOT的值有一个尾随换行符

>>> import os
>>> import subprocess
>>> ROOT = subprocess.Popen(['pwd'], stdout=subprocess.PIPE).communicate()[0]
>>> ROOT
'/Users/bgporter/personal\n'

...进行此次调用

if (os.path.isdir(SCRIPT_ROOT + "/Gerrits/HEAD/wlan")):

表现得与你不同。您可以在该值上调用strip（），或者如果您始终想要获取当前工作目录，则可以通过调用os.getcwd()

来更轻松地执行此操作

同样，您可以使用os.removedirs()函数递归删除您不想要的目录而不是shelling。

os.path.isdir检查失败

2 个答案: