[Tutor] Delete directories recursively
Hi,I need to delete a directory and its sub directories. However all dir's, sub dir;s and files have read only access. How do i do this efficeintly using the os.walk command. I cannot run this command on the dir as it gives me an error due to the read only attribute. Is there any other way to do this? -- ~~AMRESH~~ ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Delete directories recursively
Amresh Kulkarni wrote: Hi, I need to delete a directory and its sub directories. However all dir's, sub dir;s and files have read only access. How do i do this efficeintly using the os.walk command. I cannot run this command on the dir as it gives me an error due to the read only attribute. Is there any other way to do this? Maybe I'm missing something, but I don't understand how you expect to delete a directory if you don't have delete permission? Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Delete directories recursively
You must change the directory and file permissions before attempting to remove them; even if you are using a python script. Take a look at os.chmod() -mtw On Fri, Jun 16, 2006 at 10:26:34AM -0500, Amresh Kulkarni ([EMAIL PROTECTED]) wrote: Hi, I need to delete a directory and its sub directories. However all dir's, sub dir;s and files have read only access. How do i do this efficeintly using the os.walk command. I cannot run this command on the dir as it gives me an error due to the read only attribute. Is there any other way to do this? -- ~~AMRESH~~ ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Delete directories recursively
Amresh,
I had this problem a few months back. I
approached it backwards. Maybe not the right way to do it. I removed
all the files and directories and thenhad my exception handle the file if
it was read only. The exception handler changes the file from
read-only to not read only and then calls the function again.
Is there a better way to do it? Would appreciate
feedback on the code below.
import shutil
import
os
def
zaps(self):
try:
shutil.rmtree('f:/m2m')
except OSError,
inst:
print
OSError
os.chmod(inst.filename,
0666)
self.zaps()
Regards,
John.
-Original Message-From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]On Behalf Of Amresh
KulkarniSent: 16 June 2006 16:27To:
tutor@python.orgSubject: [Tutor] Delete directories
recursivelyHi,I need to delete a directory and
its sub directories. However all dir's, sub dir;s and files have read only
access. How do i do this efficeintly using the os.walk command. I cannot
run this command on the dir as it gives me an error due to the read only
attribute. Is there any other way to do this? --
~~AMRESH~~
___
Tutor maillist - Tutor@python.org
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Re: [Tutor] Delete directories recursively
John Corry wrote:
Amresh,
I had this problem a few months back. I approached it backwards. Maybe
not the right way to do it. I removed all the files and directories and
then had my exception handle the file if it was read only. The
exception handler changes the file from read-only to not read only and
then calls the function again.
Is there a better way to do it? Would appreciate feedback on the code
below.
import shutil
import os
def zaps(self):
try:
shutil.rmtree('f:/m2m')
except OSError, inst:
print OSError
os.chmod(inst.filename, 0666)
self.zaps()
I imagine this could be expensive if you have a deep directory hierarchy
with lots of read-only files - you have to start the traversal from
scratch each time you get an error. If you have more than 1000 read-only
files you will get a stack overflow from the recursion.
shutil.rmtree() actually takes an optional error handler argument.
According to the docs, If onerror is provided, it must be a callable
that accepts three parameters: function, path, and excinfo. The first
parameter, function, is the function which raised the exception; it will
be os.listdir(), os.remove() or os.rmdir().
So something like this should work and be faster because the directory
traversal doesn't restart each time (UNTESTED!!):
def handle_error(fn, path, excinfo):
if fn is os.rmdir:
# handle readonly dir
os.chmod(path, 0666) # ?? not sure if this is correct for a dir
os.rmdir(path) # try again
elif fn is os.remove:
os.chmod(path, 0666)
os.remove(path)
shutil.rmtree(top, onerror=handle_error)
Kent
___
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Re: [Tutor] Delete directories recursively
Thanks guys,Error handling seems to be a nice idea to approach this problem. i checked Kent's code and it works fine.I was using a more crude method.def removeDir(dirName) : #Remove any read-only permissions on file.
removePermissions(dirName) for name in os.listdir(dirName): file = os.path.join(dirName, name) if not os.path.islink(file) and os.path.isdir(file): removeDir(file) else:
removePermissions(file) os.remove(file) os.rmdir(dirName) returndef removePermissions(filePath) : #if (os.access(filePath, os.F_OK)) : #If path exists if (not
os.access(filePath, os.W_OK)) : os.chmod(filePath, 0666) returnhowever shutil seems to be more simple and efficient here!Regards,Amresh On 6/16/06,
Kent Johnson [EMAIL PROTECTED] wrote:
John Corry wrote: Amresh, I had this problem a few months back.I approached it backwards.Maybe not the right way to do it.I removed all the files and directories and then had my exception handle the file if it was read only.The
exceptionhandler changes the file from read-only to not read only and then calls the function again. Is there a better way to do it?Would appreciate feedback on the code below.
import shutil import os def zaps(self): try: shutil.rmtree('f:/m2m') except OSError, inst: print OSError
os.chmod(inst.filename, 0666) self.zaps()I imagine this could be expensive if you have a deep directory hierarchywith lots of read-only files - you have to start the traversal from
scratch each time you get an error. If you have more than 1000 read-onlyfiles you will get a stack overflow from the recursion.shutil.rmtree() actually takes an optional error handler argument.According to the docs, If onerror is provided, it must be a callable
that accepts three parameters: function, path, and excinfo. The firstparameter, function, is the function which raised the exception; it willbe os.listdir(), os.remove() or os.rmdir().So something like this should work and be faster because the directory
traversal doesn't restart each time (UNTESTED!!):def handle_error(fn, path, excinfo): if fn is os.rmdir: # handle readonly dir os.chmod(path, 0666) # ?? not sure if this is correct for a dir
os.rmdir(path) # try again elif fn is os.remove: os.chmod(path, 0666) os.remove(path)shutil.rmtree(top, >Kent___
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-- ~~AMRESH~~
___
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Re: [Tutor] Delete directories recursively
I need to delete a directory and its sub directories. However all dir's, sub dir;s and files have read only access. How do i do this efficeintly using the os.walk command. You can'ty since the reasoin the files are read-only is to prevent them being over-written or deleted! You need to convert them from read-only and then delete them. Its not too hard provided you have the relevant access rights to change mode. I cannot run this command on the dir as it gives me an error due to the read only attribute. Is there any other way to do this? You can only do from Python what you can do from the OS. If you don't have access to the files from the OS you won't have access from Python - thats why access rights are there! For more on how to do it we need to know your OS, since this is almost certainly a job for the OS rather than Python, unless you want to do more than just delete the files. If you do have access rights then you can find out all the needed steps in the OS topic in my tutor. Alan Gauld Author of the Learn to Program web site http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
