The opener parameter of Python 3 open() built-in
Serhiy Storchaka
storchaka at gmail.com
Mon Sep 3 12:06:14 EDT 2012
On 03.09.12 16:29, Christian Heimes wrote:
> Am 03.09.2012 14:32, schrieb Marco:
>> Does anyone have an example of utilisation?
>
> The opener argument is a new 3.3 feature. For example you can use the
> feature to implement exclusive creation of a file to avoid symlink attacks.
Or you can use new dir_fd argument for same reason (or for performance).
for root, dirs, files, rootfd in os.fwalk(topdir):
def opener(file, flags):
return os.open(file, flags, dir_fd=rootfd)
for name in files:
with open(name, "r", opener=opener) as f:
...
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