为什么shutil.copy()提出一个权限异常时cp不? [英] Why would shutil.copy() raise a permission exception when cp doesn't?
问题描述
shutil.copy()正在提出权限错误:
shutil.copy() is raising a permissions error:
Traceback (most recent call last):
File "copy-test.py", line 3, in <module>
shutil.copy('src/images/ajax-loader-000000-e3e3e3.gif', 'bin/styles/blacktie/images')
File "/usr/lib/python2.7/shutil.py", line 118, in copy
copymode(src, dst)
File "/usr/lib/python2.7/shutil.py", line 91, in copymode
os.chmod(dst, mode)
OSError: [Errno 1] Operation not permitted: 'bin/styles/blacktie/images/ajax-loader-000000-e3e3e3.gif'
copy-test.py:
copy-test.py:
import shutil
shutil.copy('src/images/ajax-loader-000000-e3e3e3.gif', 'bin/styles/blacktie/images')
我从命令行运行copy-test.py:
I am running copy-test.py from the command line:
python copy-test.py
但是运行 cp
从同一文件的命令行到同一目标不会导致错误。为什么?
But running cp
from the command line on the same file to the same destination doesn't cause an error. Why?
推荐答案
失败的操作是 chmod
复制本身:
The operation that is failing is chmod
, not the copy itself:
File "/usr/lib/python2.7/shutil.py", line 91, in copymode
os.chmod(dst, mode)
OSError: [Errno 1] Operation not permitted: 'bin/styles/blacktie/images/ajax-loader-000000-e3e3e3.gif'
这表示该文件已存在并且由其他用户拥有。
This indicates that the file already exists and is owned by another user.
shutil.copy
指定为复制权限位。如果只想复制文件内容,请使用 shutil.copyfile(src,dst)
或 shutil.copyfile(src,os.path .join(dst,os.path.basename(src)))
如果 dst
是目录。
使用 dst
文件或目录工作的函数,并且不复制权限位:
A function that works with dst
either a file or a directory and does not copy permission bits:
def copy(src, dst):
if os.path.isdir(dst):
dst = os.path.join(dst, os.path.basename(src))
shutil.copyfile(src, dst)
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