"VJ" wrote:
> I need to get the user permission of a file using python. I was trying
> the following code which i found on google grups
>
> st = os.stat(myfile)
> mode = st[stat.ST_MODE]
> if mode & stat.ST_IREAD:
> print "readable"
> if mode & stat.ST_IWRITE:
> print "writable"
> if mode & stat.ST_IEXEC:
> print "executable"
>
> I am getting a error saying
>
> " Traceback (most recent call last):
> File "./test.py", line 23, in ?
> if mode & stat.ST_IREAD:
> AttributeError: 'module' object has no attribute 'ST_IREAD' "
>
> any idea how to resolve this error ??
fix your spelling:
>>> help(stat)
Help on module stat:
...
S_IREAD = 256
S_IRGRP = 32
S_IROTH = 4
S_IRUSR = 256
...
> Basically i want to write into a file .If the permissions are not there
> then print a error message.
> How do i achive this ???
that's an entirely different thing: if you want open a file and have that
operation fail if the file doesn't have the right permissions, open the file
and deal with any error you get:
try:
f = open(filename, mode)
except IOError, v:
... cannot open the file ...
or
try:
f = open(filename, mode)
except IOError, v:
import errno
if v.errno == errno.EPERM:
... wrong permissions ...
else:
raise # some other error; propagate
(note that there's nothing that guarantees that the permissions won't
change between a stat and a subsequent open, so the "look before you
leap" approach doesn't really work for operations against the file system)
</F>
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